A male Eastern Bluebird in Queen Anne's Co., Maryland (11/16/2017). Photo by Daniel Irons. (MBP list)

An Eastern Bluebird with out-of-season prey in Howard Co., Maryland (12/17/2014). Photo by Bonnie Ott. (MBP list)

An Eastern Bluebird at Antietam National Battlefield, Washington Co., Maryland (5/5/2010). Photo by Bill Hubick. (MBP list) (More of this species)

An Eastern Bluebird in Harford Co., Maryland (10/18/2017). Photo by Josh Emm. (MBP list)

An Eastern Bluebird in Howard Co., Maryland (11/15/2014). Photo by Bonnie Ott. (MBP list)

An Eastern Bluebird in Harford Co., Maryland (12/29/2017). Photo by Mark Johnson. (MBP list)

An Eastern Bluebird in Howard Co., Maryland (3/11/2012). Photo by Kevin Heffernan. (MBP list)

An Eastern Bluebird in Harford Co., Maryland (4/2/2017). Photo by James Campbell. (MBP list)

A male Eastern Bluebird in Harford Co., Maryland (12/29/2017). Photo by Mary Sweet. (MBP list)

A female Eastern Bluebird in Harford Co., Maryland (12/29/2017). Photo by Mary Sweet. (MBP list)

An Eastern Bluebird in Washington Co., Maryland (6/7/2016). Photo by Linda Lewis. (MBP list)

An Eastern Bluebird in Talbot Co., Maryland (11/20/2018). Photo by Erica Weick. (MBP list)

An male Eastern Bluebird feeding a fledgling in Montgomery Co., Maryland (5/20/2012). Photo by Janice Browne. (MBP list)

Eastern Bluebirds in Harford Co., Maryland (1/15/2018). Photo by Mary Sweet. (MBP list)

An Eastern Bluebird nest with young in Montgomery Co., Maryland (5/8/2014). Photo by Bonnie Bell. (MBP list)

An Eastern Bluebird nest with chicks and eggs at Chino Farms in Queen Anne's Co., Maryland (4/25/2013). Photo by Maren Gimpel. (MBP list)

Eastern Bluebird eggs in Anne Arundel Co., Maryland (4/29/2018). Photo by Matthew Beziat. (MBP list)

An Eastern Bluebird nest and eggs in Montgomery Co., Maryland (4/29/2017). Photo by Max Wilson. (MBP list)