Cardellina pusilla
Length: 4-5 in Wingspan: 5-7 in Weight: 0.2-0.3 oz
Identification:
Yellow overall with olive back and black cap.
Distribution:
Range map by All About Birds
Cool Facts:
Wilson’s Warbler is one of the smallest U.S. warblers, breeding as far north as Alaska and passing through every one of the lower 48 states during migration. The bird is named for Alexander Wilson, one of the fathers of American ornithology.
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References:
Bird on the Move 