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Wild tree swallows on artificial nest box at Cosumnes River Preserve

By Western Ecological Research Center (WERC)
Wild tree swallows perched on an artificial nest box at Cosumnes River Preserve, in California’s Central Valley.
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Detailed Description

Wild tree swallows perched on an artificial nest box at Cosumnes River Preserve, in California’s Central Valley. 

Sources/Usage

Public Domain.