A Tree Swallow at Patuxent Research Refuge, Maryland (4/21/2013).

Photo by Richard Orr MBP List

Tree Swallow in Montgomery Co., Maryland (3/29/2023). (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: 770709 - Psn: 15)

Tree Swallow in Montgomery Co., Maryland (3/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC).

View Record Details Photo by Stephen John Davies via iNaturalist MBP List

A Tree Swallow in Queen Anne's Co., Maryland (6/6/2018).

View Record Details Photo by Jonathan Irons MBP List

A Tree Swallow in Howard Co., Maryland (4/28/2012).

Photo by Russ Ruffing MBP List

A Tree Swallow in Harford Co., Maryland (4/17/2016).

View Record Details Photo by Matthew Addicks MBP List

A Tree Swallow in Howard Co., Maryland (4/6/2016).

View Record Details Photo by Bonnie Ott MBP List

A Tree Swallow in Howard Co., Maryland (5/3/2017).

View Record Details Photo by Kevin Heffernan MBP List

Tree Swallows at nest box on Hart-Miller Island, Baltimore Co., Maryland (5/21/2005).

View Record Details Photo by Jim Stasz MBP List

Tree Swallow in Prince George's Co., Maryland (4/24/2021). (c) Sergei Drovetski, all rights reserved. (Photo ID: 365358 - Psn: 41)

View Record Details Photo by Sergei Drovetski MBP List

Tree Swallow in Baltimore City, Maryland (5/20/2022). (c) portofbaltimore, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 631611 - Psn: 44)

Tree Swallow in Baltimore City, Maryland (5/20/2022). (c) portofbaltimore, some rights reserved (CC BY-NC).

View Record Details Photo by portofbaltimore via iNaturalist MBP List

A Tree Swallow in Howard Co., Maryland (4/24/2016).

View Record Details Photo by Bonnie Ott MBP List

A Tree Swallow in Prince George's Co., Maryland (6/4/2019).

View Record Details Photo by Andy Connelly MBP List

A Tree Swallow in flight in Baltimore Co., Maryland (4/11/2015).

View Record Details Photo by Jon Corcoran MBP List

Tree Swallow in Howard Co., Maryland (4/15/2006). (c) Bill Hubick, all rights reserved. (Photo ID: 744988 - Psn: 55)

View Record Details Photo by Bill Hubick MBP List

Tree Swallow in Prince George's Co., Maryland (5/16/2014). (c) jugbayjs, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 778933 - Psn: 55)

Tree Swallow in Prince George's Co., Maryland (5/16/2014). (c) jugbayjs, some rights reserved (CC BY-NC).

View Record Details Photo by jugbayjs via iNaturalist MBP List

Tree Swallow in Queen Anne's Co., Maryland (6/18/2010). (c) Bill Hubick, all rights reserved. (Photo ID: 948117 - Psn: 55)

View Record Details Photo by Bill Hubick MBP List

Tree Swallow in Baltimore Co., Maryland (3/11/2021). (c) Dave, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 348501 - Psn: 66)

Tree Swallow in Baltimore Co., Maryland (3/11/2021). (c) Dave, some rights reserved (CC BY-NC).

View Record Details Photo by Dave via iNaturalist MBP List

Tree Swallow in Baltimore Co., Maryland (4/23/2013). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 696929 - Psn: 66)

Tree Swallow in Baltimore Co., Maryland (4/23/2013). (c) Frode Jacobsen, some rights reserved (CC BY-NC).

View Record Details Photo by Frode Jacobsen MBP List

Tree Swallow in Baltimore Co., Maryland (3/11/2021). (c) Dave, some rights reserved (CC BY-NC).

View Record Details Photo by Dave via iNaturalist MBP List

Tree Swallow in Anne Arundel Co., Maryland (4/16/2015). (c) Frode Jacobsen, some rights reserved (CC BY-NC)

View Record Details Photo by Frode Jacobsen MBP List

Tree Swallows can be abundant on Assateague Island in late fall (11/3/2012).

Photo by Mike Burchett MBP List

A juvenile Tree Swallow in Prince George's Co., Maryland (6/20/2009).

Photo by Bill Hubick MBP List

A Tree Swallow in Harford Co., Maryland (8/14/2016).

View Record Details Photo by Matthew Addicks MBP List

Tree Swallows on Assateague Island in Worcester Co., Maryland (11/10/2012).

Photo by Jim Stasz MBP List

Tree Swallow in Montgomery Co., Maryland (5/1/2023). (c) Matt Felperin, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by/4.0/'>CC BY</a>). (Photo ID: 991385 - Psn: 75)

Tree Swallow in Montgomery Co., Maryland (5/1/2023). (c) Matt Felperin, some rights reserved (CC BY).

View Record Details Photo by Matt Felperin via iNaturalist MBP List

Tree Swallow in Worcester Co., Maryland (11/10/2012).

Photo by Jim Stasz MBP List

Tree Swallow in Montgomery Co., Maryland (2/13/2021). (c) Dany Sloan, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 343661 - Psn: 78)

Tree Swallow in Montgomery Co., Maryland (2/13/2021). (c) Dany Sloan, some rights reserved (CC BY-NC).

View Record Details Photo by Dany Sloan via iNaturalist MBP List

Tree Swallows in Frederick Co., Maryland (4/9/2022). No rights reserved.

View Record Details Photo by Andy Wilson via iNaturalist MBP List

Tree Swallows (pair bonding) in Garrett Co., Maryland (5/7/2011). (c) Bill Hubick, all rights reserved. (Photo ID: 744992 - Psn: 115)

View Record Details Photo by Bill Hubick MBP List

Tree Swallows in Baltimore Co., Maryland (6/18/2023). (c) mkjohnsmdmn, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 827785 - Psn: 122)

Tree Swallows in Baltimore Co., Maryland (6/18/2023). (c) mkjohnsmdmn, some rights reserved (CC BY-NC).

View Record Details Photo by mkjohnsmdmn via iNaturalist MBP List

Tree Swallow nestlings in Queen Anne's Co., Maryland (5/23/2022). (c) Jonathan Irons, some rights reserved (<a rel='license' href='https://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 598606 - Psn: 145)

Tree Swallow nestlings in Queen Anne's Co., Maryland (5/23/2022). (c) Jonathan Irons, some rights reserved (CC BY-NC).

View Record Details Photo by Jonathan Irons MBP List

A Tree Swallow nest with fresh nesting material inbound in Queen Anne's Co., Maryland (5/5/2021). (c) Jonathan Irons, some rights reserved (<a rel='license' href='https://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 632373 - Psn: 145)

A Tree Swallow nest with fresh nesting material inbound in Queen Anne's Co., Maryland (5/5/2021). (c) Jonathan Irons, some rights reserved (CC BY-NC).

View Record Details Photo by Jonathan Irons MBP List

A Tree Swallow feeding chicks in Garrett Co., Maryland (7/8/2020).

View Record Details Photo by William Blauvelt MBP List

Tree Swallow in Prince George's Co., Maryland (3/21/2021). (c) Sergei Drovetski, all rights reserved. (Photo ID: 352284 - Psn: 155)

View Record Details Photo by Sergei Drovetski MBP List

Tree Swallow in Dorchester Co., Maryland (11/4/2007). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 525598 - Psn: 155)

Tree Swallow in Dorchester Co., Maryland (11/4/2007). (c) Frode Jacobsen, some rights reserved (CC BY-NC).

View Record Details Photo by Frode Jacobsen MBP List

Tree Swallow in Montgomery Co., Maryland (3/16/2024). (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: 991104 - Psn: 162)

Tree Swallow in Montgomery Co., Maryland (3/16/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC).

View Record Details Photo by Stephen John Davies via iNaturalist MBP List

Tree Swallow in Baltimore Co., Maryland (4/11/2021). (c) Emily L. Stanley, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 359487 - Psn: 166)

Tree Swallow in Baltimore Co., Maryland (4/11/2021). (c) Emily L. Stanley, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Stanley MBP List

Tree Swallow in Anne Arundel Co., Maryland (4/10/2014). (c) Frode Jacobsen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 712045 - Psn: 175)

Tree Swallow in Anne Arundel Co., Maryland (4/10/2014). (c) Frode Jacobsen, some rights reserved (CC BY-NC).

View Record Details Photo by Frode Jacobsen MBP List

Tree Swallow in Montgomery Co., Maryland (6/26/2023). (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: 837375 - Psn: 175)

Tree Swallow in Montgomery Co., Maryland (6/26/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC).

View Record Details Photo by Stephen John Davies via iNaturalist MBP List

Tree Swallow in Anne Arundel Co., Maryland (5/7/2011). (c) Bill Hubick, all rights reserved. (Photo ID: 744993 - Psn: 180)

View Record Details Photo by Bill Hubick MBP List

Tree Swallow in Anne Arundel Co., Maryland (4/20/2021). (c) Timothy Reichard, all rights reserved. (Photo ID: 363993 - Psn: 200)

View Record Details Photo by Timothy Reichard MBP List

Tree Swallow in Anne Arundel Co., Maryland (4/20/2021). (c) Timothy Reichard, all rights reserved. (Photo ID: 364000 - Psn: 200)

View Record Details Photo by Timothy Reichard MBP List

Tree Swallow in Anne Arundel Co., Maryland (5/30/2026). (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: 1515492 - Psn: 200)

Tree Swallow in Anne Arundel Co., Maryland (5/30/2026). (c) Stephen John Davies, some rights reserved (CC BY-NC)

View Record Details Photo by Stephen John Davies via iNaturalist MBP List

Tree Swallow in Anne Arundel Co., Maryland (5/20/2026). (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: 1515556 - Psn: 200)

Tree Swallow in Anne Arundel Co., Maryland (5/20/2026). (c) Stephen John Davies, some rights reserved (CC BY-NC)

View Record Details Photo by Stephen John Davies via iNaturalist MBP List

A Tree Swallow nest with young in Queen Anne's Co., Maryland (6/19/2012).

View Record Details Photo by Maren Gimpel MBP List

A Tree Swallow with unusual plumage in Washington Co., Maryland (9/13/2015).

View Record Details Photo by Jim Stasz MBP List

Tree Swallow in Montgomery Co., Maryland (4/24/2021). (c) dtread1, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 365404 - Psn: 355)

Tree Swallow in Montgomery Co., Maryland (4/24/2021). (c) dtread1, some rights reserved (CC BY-NC).

View Record Details Photo by dtread1 via iNaturalist MBP List

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

A Tree Swallow at Patuxent Research Refuge, Maryland (4/21/2013). Media by Richard Orr.

Tree Swallow in Montgomery Co., Maryland (3/29/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). View Record Details Media by Stephen John Davies via iNaturalist.

A Tree Swallow in Queen Anne's Co., Maryland (6/6/2018). View Record Details Media by Jonathan Irons.

A Tree Swallow in Howard Co., Maryland (4/28/2012). Media by Russ Ruffing.

A Tree Swallow in Harford Co., Maryland (4/17/2016). View Record Details Media by Matthew Addicks.

A Tree Swallow in Howard Co., Maryland (4/6/2016). View Record Details Media by Bonnie Ott.

A Tree Swallow in Howard Co., Maryland (5/3/2017). View Record Details Media by Kevin Heffernan.

Tree Swallows at nest box on Hart-Miller Island, Baltimore Co., Maryland (5/21/2005). View Record Details Media by Jim Stasz.

Tree Swallow in Baltimore City, Maryland (5/20/2022). (c) portofbaltimore, some rights reserved (CC BY-NC). View Record Details Media by portofbaltimore via iNaturalist.

A Tree Swallow in Howard Co., Maryland (4/24/2016). View Record Details Media by Bonnie Ott.

A Tree Swallow in Prince George's Co., Maryland (6/4/2019). View Record Details Media by Andy Connelly.

A Tree Swallow in flight in Baltimore Co., Maryland (4/11/2015). View Record Details Media by Jon Corcoran.

Tree Swallow in Prince George's Co., Maryland (5/16/2014). (c) jugbayjs, some rights reserved (CC BY-NC). View Record Details Media by jugbayjs via iNaturalist.

Tree Swallow in Baltimore Co., Maryland (3/11/2021). (c) Dave, some rights reserved (CC BY-NC). View Record Details Media by Dave via iNaturalist.

Tree Swallow in Baltimore Co., Maryland (4/23/2013). (c) Frode Jacobsen, some rights reserved (CC BY-NC). View Record Details Media by Frode Jacobsen.

Tree Swallow in Baltimore Co., Maryland (3/11/2021). (c) Dave, some rights reserved (CC BY-NC). View Record Details Media by Dave via iNaturalist.

Tree Swallow in Anne Arundel Co., Maryland (4/16/2015). (c) Frode Jacobsen, some rights reserved (CC BY-NC) View Record Details Media by Frode Jacobsen.

Tree Swallows can be abundant on Assateague Island in late fall (11/3/2012). Media by Mike Burchett.

A juvenile Tree Swallow in Prince George's Co., Maryland (6/20/2009). Media by Bill Hubick.

A Tree Swallow in Harford Co., Maryland (8/14/2016). View Record Details Media by Matthew Addicks.

Tree Swallows on Assateague Island in Worcester Co., Maryland (11/10/2012). Media by Jim Stasz.

Tree Swallow in Montgomery Co., Maryland (5/1/2023). (c) Matt Felperin, some rights reserved (CC BY). View Record Details Media by Matt Felperin via iNaturalist.

Tree Swallow in Worcester Co., Maryland (11/10/2012). Media by Jim Stasz.

Tree Swallow in Montgomery Co., Maryland (2/13/2021). (c) Dany Sloan, some rights reserved (CC BY-NC). View Record Details Media by Dany Sloan via iNaturalist.

Tree Swallows in Frederick Co., Maryland (4/9/2022). No rights reserved. View Record Details Media by Andy Wilson via iNaturalist.

Tree Swallows in Baltimore Co., Maryland (6/18/2023). (c) mkjohnsmdmn, some rights reserved (CC BY-NC). View Record Details Media by mkjohnsmdmn via iNaturalist.

Tree Swallow nestlings in Queen Anne's Co., Maryland (5/23/2022). (c) Jonathan Irons, some rights reserved (CC BY-NC). View Record Details Media by Jonathan Irons.

A Tree Swallow nest with fresh nesting material inbound in Queen Anne's Co., Maryland (5/5/2021). (c) Jonathan Irons, some rights reserved (CC BY-NC). View Record Details Media by Jonathan Irons.

A Tree Swallow feeding chicks in Garrett Co., Maryland (7/8/2020). View Record Details Media by William Blauvelt.

Tree Swallow in Dorchester Co., Maryland (11/4/2007). (c) Frode Jacobsen, some rights reserved (CC BY-NC). View Record Details Media by Frode Jacobsen.

Tree Swallow in Montgomery Co., Maryland (3/16/2024). (c) Stephen John Davies, some rights reserved (CC BY-NC). View Record Details Media by Stephen John Davies via iNaturalist.

Tree Swallow in Baltimore Co., Maryland (4/11/2021). (c) Emily L. Stanley, some rights reserved (CC BY-NC). View Record Details Media by Emily Stanley.

Tree Swallow in Anne Arundel Co., Maryland (4/10/2014). (c) Frode Jacobsen, some rights reserved (CC BY-NC). View Record Details Media by Frode Jacobsen.

Tree Swallow in Montgomery Co., Maryland (6/26/2023). (c) Stephen John Davies, some rights reserved (CC BY-NC). View Record Details Media by Stephen John Davies via iNaturalist.

Tree Swallow in Anne Arundel Co., Maryland (5/30/2026). (c) Stephen John Davies, some rights reserved (CC BY-NC) View Record Details Media by Stephen John Davies via iNaturalist.

Tree Swallow in Anne Arundel Co., Maryland (5/20/2026). (c) Stephen John Davies, some rights reserved (CC BY-NC) View Record Details Media by Stephen John Davies via iNaturalist.

A Tree Swallow nest with young in Queen Anne's Co., Maryland (6/19/2012). View Record Details Media by Maren Gimpel.

A Tree Swallow with unusual plumage in Washington Co., Maryland (9/13/2015). View Record Details Media by Jim Stasz.

Tree Swallow in Montgomery Co., Maryland (4/24/2021). (c) dtread1, some rights reserved (CC BY-NC). View Record Details Media by dtread1 via iNaturalist.