Featured in this Plate
The sky-blue upperparts of the male Cerulean Warbler can be difficult to observe in summer: At that season, the birds stay high in the tops of leafy trees in the eastern United States and extreme southern Canada. The bird itself has become harder to observe in recent decades, as its numbers have decreased in parts of its range. Brown-headed Cowbirds, which lay their eggs in this warblers' nests, may be finding their unwitting 'hosts' more easily as forest patches become smaller.
All images in our collection are provided courtesy of the at Mill Grove in 51猎奇入口, Pennsylvania; the Montgomery County 51猎奇入口 Collection; and Zebra Publishing.
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