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Wilson's warbler (Cardellina pusilla).

The warbler with a handsome black cap.

Voice of the Wild is a podcast about wildlife and the wild sounds they make.

The following Cornell Lab | Macaulay Library recordings were used in this episode:

Wilson's Warbler song by Geoffrey A. Keller (ML509373)
Wilson's Warbler call by Geoffrey A. Keller (ML509375)
Wilson's Warbler song 2 by William W. H. Gunn (ML509371)
Wilson's Warbler song 3 by Geoffrey A. Keller (ML509370)

Sources and more:

Cornell’s All About Birds
Audubon
Peterson field guide to the birds (Fourth edition)
Sibley birds East