Chestnut-sided Warbler
(Dendroica pennsylvanica)
Photographed in Costa Rica, by Jim Rosso
The bird on the left has immature plumage. The bird had probably been born in the United States and was spending its first winter in Costa Rica. The bird on the right is in spring plumage.

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Chestnut-sided Warbler Chestnut-sided Warbler

Other members of the genus Dendroica:
Palm Warbler
Yellow Warbler
Magnolia Warbler
Blackburnian Warbler
Yellow-throated Warbler
Townsend's Warbler
Black-throated Gray Warbler
Yellow-rumped Warbler
Prairie Warbler
Hermit Warbler
Black-throated Green Warbler
Blackpoll Warbler