Setophaga caerulescens
Length: 4-5 in Wingspan: 8-9 in Weight: 0.3-0.4 oz
Identification:
Dark blue back, white front with black streak along side. Black face and throat. White “handkerchief” on wing.
Distribution:
Range map by Neotropical Birds
Cool Facts:
The aptly-named Black-Throated Blue Warbler male looks so different from its drab female counterpart that they were originally described as separate species, but both share a subtle detail — a little white “handkerchief” stashed in the wing.
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References:
Bird on the Move 