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Tree swallow (Tachycineta bicolor), Yellowstone National Park, 2015.

This migratory passerine breeds in North America and winters in Mexico, Central America and the Caribbean. Very social outside breeding season, tree swallows may form flocks of several thousand birds near roost sites.

U.S. National Park Service

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Yellowstone National Park, Code: YELL

National Park Service Facebook Photos

Title: Yellowstone National Park
URL: https://www.facebook.com/YellowstoneNPS?fref=ts

20150611

06/11/2015

Public Can View

Organization: Yellowstone National Park
Address: PO Box 168, Yellowstone National Park, WY 82190-0168

Thursday, February 22, 2018 10:51:07 AM

Thursday, February 22, 2018 10:51:07 AM

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Monday, January 1, 0001 12:00:00 AM

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