Pipe Organ Mud Dauber Trypoxylon politum Drury, 1773    
Kingdom Animalia   >   Phylum Arthropoda   >   Class Insecta   >   Order Hymenoptera   >   Family Crabronidae   >   Genus Trypoxylon   

Status:

Widespread in the eastern and central U.S.

Description:

Nest structure is distinctive.

Relationships:

Spider specialists! This wasp species presents little danger to humans but plenty of danger to spiders, especially Black Widows. A female stings its prey, which paralyzes the spider. She then brings the victim to a pipe, where she may fill a cell with 5-20 spiders before laying an egg and capping off the cell. When the egg hatches, the larva feeds on the spiders, then forms a cocoon to overwinter. The following spring, adults emerge from the cocoon, chew an exit hole through the cell wall, and the life cycle of this fascinating wasp continues.

There are 198 records in the project database.

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A female Pipe Organ Mud Dauber in Montgomery Co., Maryland (9/13/2015). Verified by John S. Ascher/BugGuide. Photo by Steve Scholnick. (MBP list)

A Pipe Organ Mud Dauber in Prince George's Co., Maryland (6/8/2021). Verified by Ken Wolgemuth/BugGuide. Photo by Barbara Thurlow. (MBP list)

A Pipe Organ Mud Dauber in Kent Co., Maryland (8/9/2015). Photo by Nancy Martin. (MBP list)

A Pipe Organ Mud Dauber nest in Baltimore City, Maryland (8/28/2013). Most of the young have already departed this nest. Photo by Thomas Wilson. (MBP list)

The distinctive nests of Pipe Organ Mud Daubers (unhatched) in Worcester Co., Maryland (9/6/2014). Photo by Jim Brighton. (MBP list)

A female Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (7/25/2007). Photo by Stephen Schueman. (MBP list)

A Pipe Organ Mud Dauber nest in Calvert Co., Maryland (5/16/2014). Photo by Bill Hubick. (MBP list)

A Pipe Organ Mud Dauber nest in Frederick Co., Maryland (10/25/2014). Photo by Mark Etheridge. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (8/11/2016). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (8/30/2016). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber nests in Allegany Co., Maryland (6/26/2015). Photo by Mark Etheridge. (MBP list)

An old Pipe Organ Mud Dauber nest in Howard Co., Maryland (9/1/2016). Photo by Nancy Magnusson. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (7/26/2015). Photo by John Dennehy. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (2/17/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber nest in Washington Co., Maryland (3/24/2018). Photo by Bill Hubick. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (5/14/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (9/17/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Kent Co., Maryland (3/31/2019). (c) Ashley M Bradford, some rights reserved (CC BY-NC). Photo by Ashley Bradford. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (12/2/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

A Pipe Organ Mud Dauber in Prince George's Co., Maryland (9/18/2014). Verified by John S. Ascher/BugGuide. Photo by George Harley. (MBP list)

A Pipe Organ Mud Dauber nest in Anne Arundel Co., Maryland (1/18/2017). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (11/3/2017). Photo by Dave Webb. (MBP list)

A Pipe Organ Mud Dauber nest in Harford Co., Maryland (10/11/2014). Photo by Dave Webb. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (4/23/2017). Photo by Tyler Bell. (MBP list)

A Pipe Organ Mud Dauber nest in Calvert Co., Maryland (3/20/2017). Photo by Tyler Bell. (MBP list)

A Pipe Organ Mud Dauber nest in St. Mary's Co., Maryland (7/18/2017). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/14/2017). Photo by Dave Webb. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (11/14/2017). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (1/28/2018). Photo by Tyler Bell. (MBP list)

A Pipe Organ Mud Dauber nest in Harford Co., Maryland (4/14/2018). Photo by Dave Webb. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (4/15/2018). Photo by Wayne Longbottom. (MBP list)

Old Pipe Organ Mud Dauber nests found in Harford Co., Maryland (5/10/2018). Photo by Josh Emm. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (5/15/2018). Photo by Lori Byrne. (MBP list)

Pipe Organ Mud Dauber nests in Harford Co., Maryland (4/26/2018). Photo by Austin Jennings. (MBP list)

Pipe Organ Mud Dauber in Kent Co., Maryland (7/23/2018). Photo by Wayne Longbottom. (MBP list)

A female Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (7/30/2013). Verified by Ken Wolgemuth/BugGuide. Photo by Lynn Strauss. (MBP list)

Pipe Organ Mud Dauber nests in Dorchester Co., Maryland (9/7/2018). Photo by Richard Orr. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (4/13/2019). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (6/18/2019). Photo by Wayne Longbottom. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (2/21/2020). Photo by Matthew Beziat. (MBP list)

A Pipe Organ Mud Dauber nest in Prince George's Co., Maryland (2/23/2020). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber nests in Frederick Co., Maryland (4/20/2020). Photo by Mark Etheridge. (MBP list)

A Pipe Organ Mud Dauber nest in Anne Arundel Co., Maryland (5/3/2020). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (7/21/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (7/23/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (7/24/2020). (c) jtylerbell, some rights reserved (CC BY-NC). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Worcester Co., Maryland (6/28/2020). (c) Ashley M Bradford, some rights reserved (CC BY-NC). Photo by Ashley Bradford. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/29/2020). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (4/27/2020). (c) Jenny Glenn, some rights reserved (CC BY-NC). Photo by Jenny Glenn via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (4/25/2020). (c) susanrich01, some rights reserved (CC BY-NC). Photo by susanrich01 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (4/25/2020). (c) susanrich01, some rights reserved (CC BY-NC). Photo by susanrich01 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (8/4/2018). (c) Meghan Cassidy, some rights reserved (CC BY-SA). Photo by Meghan Cassidy via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (9/1/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Kent Co., Maryland (3/31/2019). (c) Ashley M Bradford, some rights reserved (CC BY-NC). Photo by Ashley Bradford. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (1/2/2020). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (1/2/2020). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (Date obscured). (c) romainclem, all rights reserved. Photo by romainclem via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (5/21/2020). No rights reserved. Photo by Michelle Campbell via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (5/21/2020). (c) crayshack, some rights reserved (CC BY-NC). Photo by crayshack via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore City, Maryland (5/25/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (8/20/2019). Photo by Mark Eanes. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (11/28/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (12/8/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (1/17/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (1/17/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (1/30/2021). (c) Ron Wertz, some rights reserved (CC BY-NC-SA). Photo by Ron Wertz via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (2/6/2021). (c) wildluker, some rights reserved (CC BY-NC). Photo by wildluker via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (2/6/2021). (c) wildluker, some rights reserved (CC BY-NC). Photo by wildluker via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (2/6/2021). (c) wildluker, some rights reserved (CC BY-NC). Photo by wildluker via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (2/6/2021). (c) wildluker, some rights reserved (CC BY-NC). Photo by wildluker via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (2/23/2021). (c) Zachary Dankowicz, some rights reserved (CC BY-NC). Photo by Zachary Dankowicz via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (2/23/2021). (c) Zachary Dankowicz, some rights reserved (CC BY-NC). Photo by Zachary Dankowicz via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (2/23/2021). (c) Zachary Dankowicz, some rights reserved (CC BY-NC). Photo by Zachary Dankowicz via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Frederick Co., Maryland (2/24/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (6/21/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Worcester Co., Maryland (3/13/2021). (c) Carol Mullen, some rights reserved (CC BY-NC). Photo by Carol Mullen via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Worcester Co., Maryland (3/13/2021). (c) Carol Mullen, some rights reserved (CC BY-NC). Photo by Carol Mullen via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Worcester Co., Maryland (3/13/2021). (c) Carol Mullen, some rights reserved (CC BY-NC). Photo by Carol Mullen via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/23/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (Date obscured). (c) johnbotany, some rights reserved (CC BY-NC). Photo by John Hall. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (4/25/2021). No rights reserved. Photo by lotteryd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (5/2/2021). No rights reserved. Photo by Maura via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (5/1/2021). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (5/1/2021). (c) laurabankey, some rights reserved (CC BY-NC). Photo by laurabankey via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (5/3/2021). No rights reserved. Photo by Maura via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (5/3/2021). (c) cdahlenburg, some rights reserved (CC BY-NC). Photo by cdahlenburg via iNaturalist. (MBP list)

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

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (5/9/2021). (c) srgcook, some rights reserved (CC BY-NC). Photo by srgcook via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (6/28/2020). (c) Whitni Brown, some rights reserved (CC BY-NC-SA). Photo by creepthecreek via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (6/29/2021). (c) jtylerbell, some rights reserved (CC BY-NC). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (7/10/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Frederick Co., Maryland (8/23/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (9/20/2021). (c) Peter M Martin, some rights reserved (CC BY-NC). Photo by Peter M Martin via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (9/20/2021). (c) Peter M Martin, some rights reserved (CC BY-NC). Photo by Peter M Martin via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (10/28/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (10/9/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (10/20/2021). (c) Wendy McCrady, some rights reserved (CC BY). Photo by Wendy McCrady via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (11/15/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (5/10/2021). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Frederick Co., Maryland (9/29/2021). (c) tomfeild, some rights reserved (CC BY-NC). Photo by Tom Feild. (MBP list)

Pipe Organ Mud Dauber in Garrett Co., Maryland (11/30/2021). (c) Kyle Klotz, all rights reserved. Photo by Kyle Klotz. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (1/2/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (1/2/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (1/2/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore City, Maryland (1/25/2022). (c) Sam Little, some rights reserved (CC BY-NC). Photo by Sam Little via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (2/12/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (2/12/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (2/19/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/15/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (3/16/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (3/21/2022). (c) vwiest, some rights reserved (CC BY-NC). Photo by vwiest via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (12/11/2021). (c) trinadee24, some rights reserved (CC BY-NC). Photo by trinadee24 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (12/11/2021). (c) trinadee24, some rights reserved (CC BY-NC). Photo by trinadee24 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (4/3/2022). (c) Ken Rosenthal, some rights reserved (CC BY-NC). Photo by Ken Rosenthal via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/6/2022). (c) claugis, some rights reserved (CC BY-NC). Photo by claugis via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Caroline Co., Maryland (4/11/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (4/17/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (4/11/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (4/19/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (5/1/2022). (c) Deborah Barber, some rights reserved (CC BY-NC). Photo by Deborah Barber via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (6/15/2022). (c) eddiecorwin, some rights reserved (CC BY-NC). Photo by eddiecorwin via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (6/15/2022). (c) eddiecorwin, some rights reserved (CC BY-NC). Photo by eddiecorwin via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (6/15/2022). (c) ann maj, some rights reserved (CC BY-NC). Photo by ann_maj via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (6/18/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Charles Co., Maryland (7/20/2022). No rights reserved. Photo by Nana Williams via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (7/23/2022). (c) coxfamilydc, some rights reserved (CC BY-NC). Photo by coxfamilydc via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (9/23/2017). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (7/27/2022). (c) swindsor, some rights reserved (CC BY-NC). Photo by swindsor via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (7/27/2022). (c) swindsor, some rights reserved (CC BY-NC). Photo by swindsor via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (7/27/2022). (c) swindsor, some rights reserved (CC BY-NC). Photo by swindsor via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (8/3/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (8/16/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (9/25/2020). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (9/25/2020). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (9/25/2020). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Washington Co., Maryland (9/25/2020). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (9/30/2022). (c) Molly Cohn, some rights reserved (CC BY-NC). Photo by Molly Cohn via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/10/2022). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (10/8/2022). (c) Deborah Barber, some rights reserved (CC BY-NC). Photo by Deborah Barber via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Frederick Co., Maryland (10/21/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (11/20/2022). (c) hughrand, some rights reserved (CC BY-NC). Photo by hughrand via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (12/4/2022). (c) Wayne Longbottom, some rights reserved (CC BY-NC). Photo by Wayne Longbottom. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (12/4/2022). (c) rauvbbj, some rights reserved (CC BY-NC). Photo by rauvbbj via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Caroline Co., Maryland (Date obscured). (c) Deborah Barber, some rights reserved (CC BY-NC). Photo by Deborah Barber via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Caroline Co., Maryland (Date obscured). (c) Deborah Barber, some rights reserved (CC BY-NC). Photo by Deborah Barber via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (12/30/2022). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (1/1/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (1/1/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (12/31/2022). (c) sdavis, some rights reserved (CC BY-NC). Photo by sdavis via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (1/7/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (2/26/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (4/9/2022). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (12/27/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (4/6/2021). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (9/23/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (9/7/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (9/1/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (1/8/2023). (c) Izabella Farr, some rights reserved (CC BY-NC). Photo by Izabella Farr via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Garrett Co., Maryland (10/7/2022). (c) chungler, some rights reserved (CC BY-NC). Photo by chungler via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (2/11/2023). (c) Jeff S., some rights reserved (CC BY-NC). Photo by eaglescouter2003 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (9/15/2022). (c) Brenda Bull, some rights reserved (CC BY-NC). Photo by Brenda Bull via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (2/20/2023). (c) Ken Rosenthal, some rights reserved (CC BY-NC). Photo by Ken Rosenthal via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (3/4/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (3/14/2023). (c) belby, some rights reserved (CC BY-NC). Photo by Bonnie Bell. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (3/18/2023). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (3/18/2023). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/21/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

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

Pipe Organ Mud Dauber in Montgomery Co., Maryland (3/21/2023). (c) bbuzas, some rights reserved (CC BY-NC). Photo by bbuzas via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/29/2023). (c) vwiest, some rights reserved (CC BY-NC). Photo by vwiest via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/29/2023). (c) vwiest, some rights reserved (CC BY-NC). Photo by vwiest via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/29/2023). (c) vwiest, some rights reserved (CC BY-NC). Photo by vwiest via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/1/2023). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/1/2023). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Talbot Co., Maryland (4/24/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (5/6/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (4/15/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/2/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (4/17/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Cecil Co., Maryland (7/25/2023). (c) Amaal Yazdi, some rights reserved (CC BY-NC). Photo by ayazd via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Garrett Co., Maryland (8/3/2023). (c) Bill Blauvelt, some rights reserved (CC BY-NC). Photo by Bill Blauvelt via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore City, Maryland (8/27/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/7/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/7/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/7/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (10/7/2023). (c) Sara Rall, some rights reserved (CC BY-NC). Photo by Sara Rall via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (10/15/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (11/4/2023). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (11/5/2023). (c) hmonster, some rights reserved (CC BY-NC). Photo by hmonster via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (11/11/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (11/19/2023). (c) russruffing, some rights reserved (CC BY-NC). Photo by russruffing via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (12/3/2023). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (3/13/2023). (c) Carrie Seltzer, some rights reserved (CC BY-NC). Photo by Carrie Seltzer via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (3/13/2023). (c) Carrie Seltzer, some rights reserved (CC BY-NC). Photo by Carrie Seltzer via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Garrett Co., Maryland (9/29/2023). (c) Bill Blauvelt, some rights reserved (CC BY-NC). Photo by Bill Blauvelt via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (1/23/2024). (c) belby, some rights reserved (CC BY-NC). Photo by Bonnie Bell. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (2/18/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (2/24/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (2/26/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (8/3/2019). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (2/3/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Anne Arundel Co., Maryland (3/8/2024). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (3/14/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Kent Co., Maryland (3/16/2024). (c) Samantha Hagler, some rights reserved (CC BY-NC). Photo by Samantha Hagler via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Kent Co., Maryland (12/30/2023). (c) Dennis Tarnay, Jr., some rights reserved (CC BY-NC-ND). Photo by Dennis Tarnay, Jr. via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (3/18/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (4/14/2024). (c) Matthew Beziat, some rights reserved (CC BY-NC). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (4/21/2024). (c) epic2112, some rights reserved (CC BY-NC). Photo by epic2112 via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (4/29/2024). (c) Michael Eversmier, some rights reserved (CC BY-NC). Photo by michaelthefish via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Prince George's Co., Maryland (4/29/2024). (c) Heather, some rights reserved (CC BY-NC-SA). Photo by Heather via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Baltimore Co., Maryland (5/3/2024). (c) Peter M Martin, some rights reserved (CC BY-NC). Photo by Peter M Martin via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Frederick Co., Maryland (4/29/2018). (c) botanygirl, some rights reserved (CC BY). Photo by botanygirl via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Caroline Co., Maryland (6/1/2024). (c) Jane Hill, some rights reserved (CC BY-NC). Photo by Jane Hill. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (6/24/2019). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Pipe Organ Mud Dauber in Queen Anne's Co., Maryland (6/24/2019). (c) Jane Hartman, all rights reserved. Photo by Jane Hartman. (MBP list)

Pipe Organ Mud Dauber in Maryland (Date obscured). (c) Mariko, some rights reserved (CC BY-NC). Photo by Mariko via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in Howard Co., Maryland (Date obscured). (c) johnbotany, all rights reserved. Photo by John Hall. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (7/13/2024). (c) lesliemcg, some rights reserved (CC BY-NC). Photo by lesliemcg via iNaturalist. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (7/8/2022). (c) janekostenko, some rights reserved (CC BY-NC). Photo by Jane Kostenko. (MBP list)

Pipe Organ Mud Dauber in Calvert Co., Maryland (8/25/2024). (c) Tonyia Johnson, some rights reserved (CC BY-NC). Photo by tonyiajohnson via iNaturalist. (MBP list)

Pipe Organ Mud Dauber nest in Howard Co., Maryland (8/11/2017). Photo by Bill Hubick. (MBP list)

Pipe Organ Mud Dauber nest in Howard Co., Maryland (10/9/2017). Photo by Bill Hubick. (MBP list)

Old Pipe Organ Mud Dauber nests in Washington Co., Maryland (4/15/2018). Photo by Bill Hubick. (MBP list)

Pipe Organ Mud Dauber nest in Baltimore Co., Maryland (4/22/2018). Photo by Bill Hubick. (MBP list)

Pipe Organ Mud Dauber in Harford Co., Maryland (4/1/2017). Photo by Bill Hubick. (MBP list)

Pipe Organ Mud Dauber in Dorchester Co., Maryland (9/8/2018). Photo by Sue Muller. (MBP list)

Pipe Organ Mud Dauber in Montgomery Co., Maryland (4/14/2018). Photo by Bonnie Bell. (MBP list)

Pipe Organ Mud Dauber in Carroll Co., Maryland (2/17/2020). Photo by Matthew Beziat. (MBP list)

Pipe Organ Mud Dauber in St. Mary's Co., Maryland (3/25/2017). Photo by Tyler Bell. (MBP list)

Pipe Organ Mud Dauber in Allegany Co., Maryland (6/26/2015). Photo by Jim Brighton. (MBP list)


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