Eastern Bluebirds (Sialia sialis)
… are a common site in the eastern U.S., but did you know that their populations were plummeting prior to the 1960s? For a time, competition with larger and more aggressive introduced species like European Starlings and House Sparrows made it hard for bluebirds to find and hold on to nest holes. Bluebird trails and other nest box campaigns, using boxes designed to keep out larger birds, alleviated this competition and allowed the Eastern Bluebird to make a comeback.  Photo: Bill Thompson/USFWS
(via: USFWS_Migratory Birds)

Eastern Bluebirds (Sialia sialis)

… are a common site in the eastern U.S., but did you know that their populations were plummeting prior to the 1960s? For a time, competition with larger and more aggressive introduced species like European Starlings and House Sparrows made it hard for bluebirds to find and hold on to nest holes. Bluebird trails and other nest box campaigns, using boxes designed to keep out larger birds, alleviated this competition and allowed the Eastern Bluebird to make a comeback.

Photo: Bill Thompson/USFWS

(via: USFWS_Migratory Birds)

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