High Quality Content by WIKIPEDIA articles! The Black-throated Blue Warbler, Dendroica caerulescens, is a small songbird of the New World warbler family. Adult males have white underparts with black throat, face and flanks; the upperparts are deep blue; immature males are similar with upperparts more greenish. Females have olive-brown upperparts and light yellow underparts with darker wings and tail, a grey crown and a brown patch on the cheek. All birds have a small white wing patch which is not always visible, and a thin pointed bill. Like many warblers, this bird has colorful plumage during the spring and summer, but its fall plumage is drab and less distinctive. In the fall, it can still be identified from other similar warblers by its small white wing patch.

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