Black-throated Green Warbler

The Black-throated Green Warbler is a small, brightly patterned wood-warbler breeding in coniferous and mixed forests across a wide swath of North America, from the boreal forest south into Appalachian highlands, and wintering from Mexico to northern South America. Its combination of an olive-green crown and back, bright yellow face, and black throat and upper breast makes it one of the more readily identified warblers.

The crown, nape, and back feathers are olive-green, while the face is bright yellow, broken only by a faint olive line through the eye. The throat and upper breast in breeding males are solid black, extending into streaking along the white flanks. Wings show two white wingbars against darker flight feathers. This pattern of yellow face, olive-green crown, and black throat distinguishes it from other similarly sized warblers with yellow faces.

Breeding males show the boldest black throat and upper breast; females and immatures have a paler, more mottled throat with less solid black, sometimes reduced to a scattering of dark spots. The yellow face and olive-green upperparts remain consistent across sexes and ages, though duller in immature birds. A single complete molt follows the breeding season.

This species breeds in coniferous and mixed forests, including spruce, hemlock, and pine stands, across a broad range from Canada south through the northeastern United States and Appalachian Mountains. It winters in forest and forest-edge habitats from Mexico through Central America to northern South America.

Black-throated Green Warblers forage for insects in the mid to upper canopy, often moving methodically along branches. The male's song is a distinctive, buzzy "zee-zee-zee-zoo-zee." Nests are built as cups placed on horizontal branches, often well up in a conifer. The species is a nocturnal migrant, moving between breeding and wintering grounds each year.