Description
The Black-throated Blue Warbler measures 13 cm (5.1 in) in length and weighs 8.4-12.4 g (0.3-0.45 oz). Adult males have white underparts with black throats, faces and flanks. Their upperparts are deep blue. Immature males are similar, but with greener upperparts. Females have olive-brown upperparts and light yellow underparts with darker wings and tails, gray crowns and brown patches on the cheek. All Black-throated Blue Warblers have thin pointed bills and small white wing patches which are not always visible. Like many warblers, they have colorful plumage during the spring and summer, but their fall plumage is drab and less distinctive. In the fall, they can still be identified from other similar warblers by their small white wing patches. Juveniles have brown upperparts with creamy supercilium and brownish spots on throat, breast and belly.
The bird's song can be described as a buzzed zee-zee-zeeee with an upward inflection. Its call is a flat ctuk.
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