Maryland Biodiversity Project - Cliff Swallow (Petrochelidon pyrrhonota)

Cliff Swallow Petrochelidon pyrrhonota Vieillot, 1817

Synonyms: CLSW, Eave Swallow.

Kingdom Animalia > Phylum Chordata > Class Aves > Order Passeriformes > Family Hirundinidae > Genus Petrochelidon Cliff Swallow - Petrochelidon pyrrhonota - https://www.marylandbiodiversity.com/view/1195

Status:

Cliff Swallows nest communally on bridges and similar structures in Maryland, tending to be more common in the Piedmont than on the coastal plain. They are very localized breeders on the Eastern Shore and in southern Maryland. They are long distance migrants and winter in South America.

Where to find:

Brighton Dam, Prettyboy Reservoir.

Records:

There are 254 records in the project database.

Links:

View full eBird Range Map

View taxon at iNaturalist

View taxon at NatureServe

Search Google Images

Search MBP Facebook posts (beta | requires login)

Seasonality:

[View seasonality details]

A Cliff Swallow on the wing in Howard Co., Maryland (5/4/2013). (Photo ID: 39781 - Psn: 5)

A Cliff Swallow on the wing in Howard Co., Maryland (5/4/2013). Photo by Mark Johnson. (MBP list)

A cooperative Cliff Swallow at Piney Reservoir, Garrett Co., Maryland (4/30/2011). (Photo ID: 188 - Psn: 10)

A cooperative Cliff Swallow at Piney Reservoir, Garrett Co., Maryland (4/30/2011). Photo by Bill Hubick. (MBP list)

A Cliff Swallow in Talbot Co., Maryland (4/27/2016). (Photo ID: 47066 - Psn: 30)

A Cliff Swallow in Talbot Co., Maryland (4/27/2016). Photo by Tim Carney. (MBP list)

Cliff Swallows nesting over Prettyboy Reservoir in Baltimore Co., Maryland (5/14/2015). (Photo ID: 23552 - Psn: 40)

Cliff Swallows nesting over Prettyboy Reservoir in Baltimore Co., Maryland (5/14/2015). Photo by Mark Johnson. (MBP list)

A Cliff Swallow in flight in Cumberland, Maryland (6/17/2012). (Photo ID: 1014 - Psn: 50)

A Cliff Swallow in flight in Cumberland, Maryland (6/17/2012). Photo by Evelyn Ralston. (MBP list)

A Cliff Swallow in Baltimore Co., Maryland (4/26/2015). (Photo ID: 25123 - Psn: 50)

A Cliff Swallow in Baltimore Co., Maryland (4/26/2015). Photo by Bill Keim. (MBP list)

A Cliff Swallow in Howard Co., Maryland (4/30/2017). (Photo ID: 74722 - Psn: 50)

A Cliff Swallow in Howard Co., Maryland (4/30/2017). Photo by Kevin Heffernan. (MBP list)

A Cliff Swallow at Loch Raven Reservoir, Baltimore Co., Maryland (6/20/2010). (Photo ID: 46054 - Psn: 78)

A Cliff Swallow at Loch Raven Reservoir, Baltimore Co., Maryland (6/20/2010). Photo by Kye Jenkins. (MBP list)

Cliff Swallow nests in Cumberland, Allegany Co., Maryland (6/16/2012). (Photo ID: 1026 - Psn: 80)

Cliff Swallow nests in Cumberland, Allegany Co., Maryland (6/16/2012). Photo by Evelyn Ralston. (MBP list)

Cliff Swallow in Washington Co., Maryland (6/25/2022). (c) Dany Sloan, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 594212 - Psn: 88)

Cliff Swallow in Washington Co., Maryland (6/25/2022). (c) Dany Sloan, some rights reserved (CC BY-NC). Photo by Dany Sloan via iNaturalist. (MBP list)

Cliff Swallows in Caroline Co., Maryland (7/23/2015). (Photo ID: 113596 - Psn: 150)

Cliff Swallows in Caroline Co., Maryland (7/23/2015). Photo by Mark Johnson. (MBP list)

A Cliff Swallow in Montgomery Co., Maryland (6/25/2016). (Photo ID: 127981 - Psn: 155)

A Cliff Swallow in Montgomery Co., Maryland (6/25/2016). Photo by Bonnie Bell. (MBP list)

Cliff Swallow in Cecil Co., Maryland (8/17/2022). (c) Jonathan Irons, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 632389 - Psn: 166)

Cliff Swallow in Cecil Co., Maryland (8/17/2022). (c) Jonathan Irons, some rights reserved (CC BY-NC). Photo by Jonathan Irons. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/18/2022). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 574673 - Psn: 176)

Cliff Swallow in Montgomery Co., Maryland (5/18/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/29/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 940443 - Psn: 180)

Cliff Swallow in Montgomery Co., Maryland (7/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

A Cliff Swallow in Carroll Co., Maryland (5/17/2017). (Photo ID: 99864 - Psn: 200)

A Cliff Swallow in Carroll Co., Maryland (5/17/2017). Photo by Emily Carter Mitchell. (MBP list)

Cliff Swallows in Washington Co., Maryland (5/3/2017). (Photo ID: 75467 - Psn: 200)

Cliff Swallows in Washington Co., Maryland (5/3/2017). Photo by Linda Lewis. (MBP list)

A Cliff Swallow in Harford Co., Maryland (6/1/2017). (Photo ID: 78257 - Psn: 200)

A Cliff Swallow in Harford Co., Maryland (6/1/2017). Photo by Josh Emm. (MBP list)

Cliff Swallows in Howard Co., Maryland (5/13/2017). (Photo ID: 100135 - Psn: 200)

Cliff Swallows in Howard Co., Maryland (5/13/2017). Photo by Sue Muller. (MBP list)

A pair of Cliff Swallows in Washington Co., Maryland (5/10/2016). (Photo ID: 112230 - Psn: 200)

A pair of Cliff Swallows in Washington Co., Maryland (5/10/2016). Photo by Mark Johnson. (MBP list)

A nesting Cliff Swallow in Baltimore Co., Maryland (4/25/2014). (Photo ID: 112231 - Psn: 200)

A nesting Cliff Swallow in Baltimore Co., Maryland (4/25/2014). Photo by Mark Johnson. (MBP list)

Cliff Swallows in Baltimore Co., Maryland (7/23/2011). (Photo ID: 112232 - Psn: 200)

Cliff Swallows in Baltimore Co., Maryland (7/23/2011). Photo by Mark Johnson. (MBP list)

A Cliff Swallow in Harford Co., Maryland (5/5/2015). (Photo ID: 112233 - Psn: 200)

A Cliff Swallow in Harford Co., Maryland (5/5/2015). Photo by Mark Johnson. (MBP list)

A Cliff Swallow in Harford Co., Maryland (7/4/2018). (Photo ID: 114960 - Psn: 200)

A Cliff Swallow in Harford Co., Maryland (7/4/2018). Photo by Josh Emm. (MBP list)

A Cliff Swallow in Queen Anne's Co., Maryland (10/19/2018). (Photo ID: 136486 - Psn: 200)

A Cliff Swallow in Queen Anne's Co., Maryland (10/19/2018). Photo by Daniel Irons. (MBP list)

Cliff Swallow nests in Howard Co., Maryland (5/11/2019). (Photo ID: 139624 - Psn: 200)

Cliff Swallow nests in Howard Co., Maryland (5/11/2019). Photo by Sue Muller. (MBP list)

A Cliff Swallow building a nest in Garrett Co., Maryland (6/11/2020). (Photo ID: 174984 - Psn: 200)

A Cliff Swallow building a nest in Garrett Co., Maryland (6/11/2020). Photo by William Blauvelt. (MBP list)

Cliff Swallows in Calvert Co., Maryland (5/13/2020). (Photo ID: 174998 - Psn: 200)

Cliff Swallows in Calvert Co., Maryland (5/13/2020). Photo by Jim Stasz. (MBP list)

Cliff Swallows in Queen Anne's Co., Maryland (5/7/2020). (Photo ID: 175824 - Psn: 200)

Cliff Swallows in Queen Anne's Co., Maryland (5/7/2020). Photo by Dan Small. (MBP list)

Cliff Swallow in Caroline Co., Maryland (6/25/2020). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 177924 - Psn: 200)

Cliff Swallow in Caroline Co., Maryland (6/25/2020). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/29/2020). (c) lisamarie, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 179033 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/29/2020). (c) lisamarie, some rights reserved (CC BY-NC). Photo by lisamarie via iNaturalist. (MBP list)

Cliff Swallows nesting in Garrett Co., Maryland (7/2/2020). (Photo ID: 223671 - Psn: 200)

Cliff Swallows nesting in Garrett Co., Maryland (7/2/2020). Photo by William Blauvelt. (MBP list)

Cliff Swallow in Talbot Co., Maryland (5/23/2020). (c) jared satchell, all rights reserved. (Photo ID: 237849 - Psn: 200)

Cliff Swallow in Anne Arundel Co., Maryland (7/14/2020). (c) Tim Frye, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 299932 - Psn: 200)

Cliff Swallow in Anne Arundel Co., Maryland (7/14/2020). (c) Tim Frye, some rights reserved (CC BY-NC). Photo by Tim Frye via iNaturalist. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (6/21/2020). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 320325 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (6/21/2020). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (5/3/2021). (c) laurabankey, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 372890 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (5/3/2021). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/12/2021). (c) Jim, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 377396 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/12/2021). (c) Jim, some rights reserved (CC BY-NC). Photo by Jim via iNaturalist. (MBP list)

Cliff Swallow in Frederick Co., Maryland (5/28/2021). No rights reserved. (Photo ID: 387206 - Psn: 200)

Cliff Swallow in Frederick Co., Maryland (5/28/2021). No rights reserved. Photo by Andy Wilson via iNaturalist. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (6/1/2021). (c) ekreiss, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 404081 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (6/1/2021). (c) ekreiss, some rights reserved (CC BY-NC). Photo by ekreiss via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/29/2021). (c) dtread1, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 404557 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/29/2021). (c) dtread1, some rights reserved (CC BY-NC). Photo by dtread1 via iNaturalist. (MBP list)

Cliff Swallow in Washington Co., Maryland (6/23/2021). (c) Wendy R Fredericks, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 405454 - Psn: 200)

Cliff Swallow in Washington Co., Maryland (6/23/2021). (c) Wendy R Fredericks, some rights reserved (CC BY-NC). Photo by Wendy R. Fredericks. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/12/2021). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 411705 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/12/2021). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Frederick Co., Maryland (7/20/2021). No rights reserved. (Photo ID: 417024 - Psn: 200)

Cliff Swallow in Frederick Co., Maryland (7/20/2021). No rights reserved. Photo by Andy Wilson via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (4/22/2020). (c) Dave Roberts, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 419622 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (4/22/2020). (c) Dave Roberts, some rights reserved (CC BY-NC). Photo by Dave Roberts. (MBP list)

Cliff Swallow in Garrett Co., Maryland (5/8/2021). (c) david mlr, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 450721 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (5/8/2021). (c) david mlr, some rights reserved (CC BY-NC). Photo by david_mlr via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (5/21/2021). (c) tomfeild, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 487802 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (5/21/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Cliff Swallow in Garrett Co., Maryland (4/27/2018). (c) Kyle Klotz, all rights reserved. (Photo ID: 488396 - Psn: 200)

Cliff Swallow in Harford Co., Maryland (5/3/2021). (c) apistopanchax, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 488457 - Psn: 200)

Cliff Swallow in Harford Co., Maryland (5/3/2021). (c) apistopanchax, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Cliff Swallow in St. Mary's Co., Maryland (5/13/2020). (c) Scott Clark, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 557395 - Psn: 200)

Cliff Swallow in St. Mary's Co., Maryland (5/13/2020). (c) Scott Clark, some rights reserved (CC BY). Photo by sfc155 via iNaturalist. (MBP list)

Cliff Swallow in Dorchester Co., Maryland (4/24/2022). (c) Jim Brighton, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 559632 - Psn: 200)

Cliff Swallow in Dorchester Co., Maryland (4/24/2022). (c) Jim Brighton, some rights reserved (CC BY-NC). Photo by Jim Brighton. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (5/1/2022). (c) laurabankey, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 561809 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (5/1/2022). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (5/14/2022). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 570762 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (5/14/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/19/2022). (c) dtread1, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 572268 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/19/2022). (c) dtread1, some rights reserved (CC BY-NC). Photo by dtread1 via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/18/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/1/2022). (c) dtread1, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 579805 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/1/2022). (c) dtread1, some rights reserved (CC BY-NC). Photo by dtread1 via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (6/2/2022). (c) Josh Emm, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 579968 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (6/2/2022). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/1/2022). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 580264 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/1/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Allegany Co., Maryland (6/5/2022). (c) Aidan Flinn, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 581929 - Psn: 200)

Cliff Swallow in Allegany Co., Maryland (6/5/2022). (c) Aidan Flinn, some rights reserved (CC BY-NC). Photo by aidanrf via iNaturalist. (MBP list)

Cliff Swallow in St. Mary's Co., Maryland (5/7/2022). (c) Scott Clark, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 587607 - Psn: 200)

Cliff Swallow in St. Mary's Co., Maryland (5/7/2022). (c) Scott Clark, some rights reserved (CC BY). Photo by sfc155 via iNaturalist. (MBP list)

Cliff Swallow in Talbot Co., Maryland (6/19/2022). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 591756 - Psn: 200)

Cliff Swallow in Talbot Co., Maryland (6/19/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/6/2022). (c) dtread1, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 599467 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/6/2022). (c) dtread1, some rights reserved (CC BY-NC). Photo by dtread1 via iNaturalist. (MBP list)

Cliff Swallow in Allegany Co., Maryland (7/10/2022). (c) Aidan Flinn, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 601879 - Psn: 200)

Cliff Swallow in Allegany Co., Maryland (7/10/2022). (c) Aidan Flinn, some rights reserved (CC BY-NC). Photo by aidanrf via iNaturalist. (MBP list)

Cliff Swallow in Frederick Co., Maryland (7/12/2022). (c) Mike Mosser, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 603274 - Psn: 200)

Cliff Swallow in Frederick Co., Maryland (7/12/2022). (c) Mike Mosser, some rights reserved (CC BY-NC). Photo by Mike Mosser via iNaturalist. (MBP list)

Cliff Swallow in Allegany Co., Maryland (7/16/2022). (c) rando boyo, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 608193 - Psn: 200)

Cliff Swallow in Allegany Co., Maryland (7/16/2022). (c) rando boyo, some rights reserved (CC BY-NC). Photo by rando_boyo via iNaturalist. (MBP list)

Cliff Swallow in Allegany Co., Maryland (7/10/2022). (c) Aidan Flinn, some rights reserved (CC BY-NC). Photo by aidanrf via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Josh Emm, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 611788 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Cliff Swallow in Carroll Co., Maryland (6/8/2022). (c) tomfeild, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 621735 - Psn: 200)

Cliff Swallow in Carroll Co., Maryland (6/8/2022). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Cliff Swallow in Carroll Co., Maryland (5/7/2022). (c) tomfeild, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 622615 - Psn: 200)

Cliff Swallow in Carroll Co., Maryland (5/7/2022). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Cliff Swallow in Allegany Co., Maryland (7/10/2022). (c) Aidan Flinn, some rights reserved (CC BY-NC). Photo by aidanrf via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/14/2022). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 624564 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/14/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (7/22/2022). (c) laurabankey, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 637384 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (7/22/2022). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (4/30/2011). (c) Matt Tillett, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 640231 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (4/30/2011). (c) Matt Tillett, some rights reserved (CC BY-NC). Photo by mtillett via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/1/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Caroline Co., Maryland (6/17/2022). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 680601 - Psn: 200)

Cliff Swallow in Caroline Co., Maryland (6/17/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Cliff Swallow in Talbot Co., Maryland (6/17/2022). (c) Wayne Longbottom, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 680605 - Psn: 200)

Cliff Swallow in Talbot Co., Maryland (6/17/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Cliff Swallow in Harford Co., Maryland (7/4/2018). (c) Josh Emm, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 686273 - Psn: 200)

Cliff Swallow in Harford Co., Maryland (7/4/2018). (c) Josh Emm, some rights reserved (CC BY-NC). Photo by Josh Emm. (MBP list)

Cliff Swallow in Anne Arundel Co., Maryland (5/2/2016). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 734683 - Psn: 200)

Cliff Swallow in Anne Arundel Co., Maryland (5/2/2016). (c) Frode Jacobsen, some rights reserved (CC BY-NC). Photo by Frode Jacobsen. (MBP list)

Cliff Swallow in Talbot Co., Maryland (9/12/2012). (c) jugbayjs, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 747973 - Psn: 200)

Cliff Swallow in Talbot Co., Maryland (9/12/2012). (c) jugbayjs, some rights reserved (CC BY-NC). Photo by jugbayjs via iNaturalist. (MBP list)

Cliff Swallow in Calvert Co., Maryland (5/16/2021). (c) Spencer McIntyre, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 776362 - Psn: 200)

Cliff Swallow in Calvert Co., Maryland (5/16/2021). (c) Spencer McIntyre, some rights reserved (CC BY). Photo by Spencer McIntyre via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (4/23/2023). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 786200 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (4/23/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Cliff Swallow in Caroline Co., Maryland (6/17/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Brady O'Brien, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 806824 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Brady O'Brien, some rights reserved (CC BY-NC). Photo by brady_obrien via iNaturalist. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (5/23/2023). (c) trinectes, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 807759 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (5/23/2023). (c) trinectes, some rights reserved (CC BY-NC). Photo by Robert Aguilar, SERC. (MBP list)

Cliff Swallow in Queen Anne's Co., Maryland (5/24/2023). (c) Jonathan Irons, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 811688 - Psn: 200)

Cliff Swallow in Queen Anne's Co., Maryland (5/24/2023). (c) Jonathan Irons, some rights reserved (CC BY-NC). Photo by Jonathan Irons via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/9/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 813627 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/9/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/10/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 814549 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/10/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Harford Co., Maryland (Date obscured). (c) jugbayjs, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 823746 - Psn: 200)

Cliff Swallow in Harford Co., Maryland (Date obscured). (c) jugbayjs, some rights reserved (CC BY-NC). Photo by jugbayjs via iNaturalist. (MBP list)

Cliff Swallow in Frederick Co., Maryland (5/29/2023). (c) Chris Canipe, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc-sa/4.0/'>CC BY-NC-SA</a>). (Photo ID: 826434 - Psn: 200)

Cliff Swallow in Frederick Co., Maryland (5/29/2023). (c) Chris Canipe, some rights reserved (CC BY-NC-SA). Photo by Chris Canipe via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Mike Mosser, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 836941 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (Date obscured). (c) Mike Mosser, some rights reserved (CC BY-NC). Photo by Mike Mosser via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (6/22/2023). (c) Aidan, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 837517 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (6/22/2023). (c) Aidan, some rights reserved (CC BY-NC). Photo by aidanrf via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/28/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 839225 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/28/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/2/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 840474 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/2/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (6/29/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 841606 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (6/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (7/4/2023). (c) laurabankey, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 846215 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (7/4/2023). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/6/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 846230 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/6/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/22/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 850597 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/22/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (7/28/2023). (c) Jayden Ward, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 855922 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (7/28/2023). (c) Jayden Ward, some rights reserved (CC BY-NC). Photo by someowletmoth221 via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/2/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 860408 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/2/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/3/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 860468 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/3/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/4/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 863016 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/4/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/9/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 876481 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/9/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/8/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 877486 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/8/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Frederick Co., Maryland (6/2/2019). (c) Oliver Patrick, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 882213 - Psn: 200)

Cliff Swallow in Frederick Co., Maryland (6/2/2019). (c) Oliver Patrick, some rights reserved (CC BY-NC). Photo by Oliver Patrick via iNaturalist. (MBP list)

Cliff Swallow in Somerset Co., Maryland (9/4/2023). (c) Jonathan Irons, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 883289 - Psn: 200)

Cliff Swallow in Somerset Co., Maryland (9/4/2023). (c) Jonathan Irons, some rights reserved (CC BY-NC). Photo by Jonathan Irons via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (8/8/2023). (c) russruffing, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 886690 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (8/8/2023). (c) russruffing, some rights reserved (CC BY-NC). Photo by russruffing via iNaturalist. (MBP list)

Cliff Swallow in Howard Co., Maryland (5/25/2023). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 894966 - Psn: 200)

Cliff Swallow in Howard Co., Maryland (5/25/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Cliff Swallow in Garrett Co., Maryland (9/5/2023). (c) Alina Martin, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 902364 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (9/5/2023). (c) Alina Martin, some rights reserved (CC BY). Photo by Alina Martin via iNaturalist. (MBP list)

Cliff Swallow in Carroll Co., Maryland (5/13/2021). (c) Alina Martin, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 912523 - Psn: 200)

Cliff Swallow in Carroll Co., Maryland (5/13/2021). (c) Alina Martin, some rights reserved (CC BY). Photo by Alina Martin via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Baltimore City, Maryland (6/15/2021). (c) Alina Martin, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 960920 - Psn: 200)

Cliff Swallow in Baltimore City, Maryland (6/15/2021). (c) Alina Martin, some rights reserved (CC BY). Photo by Alina Martin via iNaturalist. (MBP list)

Cliff Swallow in Washington Co., Maryland (6/3/2023). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 963142 - Psn: 200)

Cliff Swallow in Washington Co., Maryland (6/3/2023). (c) Frode Jacobsen, some rights reserved (CC BY-NC). Photo by Frode Jacobsen. (MBP list)

Cliff Swallow in Anne Arundel Co., Maryland (9/29/2023). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 963194 - Psn: 200)

Cliff Swallow in Anne Arundel Co., Maryland (9/29/2023). (c) Frode Jacobsen, some rights reserved (CC BY-NC). Photo by Frode Jacobsen. (MBP list)

Cliff Swallow in Baltimore Co., Maryland (2/25/2024). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 972943 - Psn: 200)

Cliff Swallow in Baltimore Co., Maryland (2/25/2024). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (4/7/2024). (c) Carla Morris, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 992996 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (4/7/2024). (c) Carla Morris, some rights reserved (CC BY-NC). Photo by cammfl via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (4/20/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1012257 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (4/20/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (4/26/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1012355 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (4/26/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/23/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1012651 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/23/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/24/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1012702 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/24/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/26/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1012770 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/26/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/10/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1013111 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/10/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/7/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1013336 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/7/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/8/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1013350 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/8/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/4/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1014879 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/4/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (4/8/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1015232 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (4/8/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (7/5/2022). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1015736 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (7/5/2022). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/17/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1019046 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/17/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Allegany Co., Maryland (5/16/2024). (c) Tom Murray, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1020535 - Psn: 200)

Cliff Swallow in Allegany Co., Maryland (5/16/2024). (c) Tom Murray, some rights reserved (CC BY-NC). Photo by Tom Murray via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/19/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1021304 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/19/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/20/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1021998 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/20/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (5/22/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1023032 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (5/22/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Garrett Co., Maryland (5/18/2024). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1027931 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (5/18/2024). (c) Frode Jacobsen, some rights reserved (CC BY-NC). Photo by Frode Jacobsen. (MBP list)

Cliff Swallow in Garrett Co., Maryland (6/8/2024). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1039385 - Psn: 200)

Cliff Swallow in Garrett Co., Maryland (6/8/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/14/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1046353 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/14/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/16/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1049052 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/16/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/22/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1050111 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/22/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

Cliff Swallow in Montgomery Co., Maryland (8/25/2023). (c) Stephen John Davies, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 1050627 - Psn: 200)

Cliff Swallow in Montgomery Co., Maryland (8/25/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). Photo by Stephen John Davies via iNaturalist. (MBP list)

View All Images

Use of images featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.