It has an olive-green crown, a yellow face with olive markings, a thin pointed bill, white wing bars, an olive-green back and pale underparts with black streaks on the flanks. Adult males have a black throat and upper breast; females have a pale throat and black markings on their breast.
The breeding habitat of the black-throated green warbler is coniferous and mixed forests in eastern North America and western Canada and cypressswamps on the southern Atlantic coast, with preference for dense stands of conifers.[3] These birds' nests are open cups, which are usually situated close to the trunk of a tree.
The black-throated green warbler has been reported to hybridize with the congeneric Townsend's warbler where their range overlaps in the Rocky Mountains.[4]
Black-throated green warblers forage actively in vegetation, and they sometimes hover (gleaning), or catch insects in flight (hawking). Insects are the main constituents of these birds' diets, although berries will occasionally be consumed.
The song of this bird is a buzzed zee-zee-zee-zooo-zeetorzoo-zee-zoo-zoo-zeet. The call is a sharp tsip.[5]
^Toews, David P.L.; Brelsford, Alan; Irwin, Darren E. (2011). "Hybridization between Townsend's Dendroica townsendi and blackt-hroated green warblers D. virens in an avian suture zone". Journal of Avian Biology. 42 (5): 434–446. doi:10.1111/j.1600-048X.2011.05360.x.
^Morse, D. H. 1993. Black-throated Green Warbler (Dendroica virens). In The Birds of North America, No. 55 (A. Poole and F. Gill, eds.). Philadelphia: The Academy of Natural Sciences, Washington, DC: The American Ornithologists’ Union.
Curson, Jon; Quinn, David; Beadle, David (1994). New World Warblers. London: Christopher Helm. ISBN0-7136-3932-6.
Stiles; Skutch (1989). A guide to the birds of Costa Rica. Comstock. ISBN0-8014-9600-4.
World Wildlife Fund (2010). "Petenes mangroves". In Mark McGinley; C. Michael Hogan; C. Cleveland (eds.). Encyclopedia of Earth. Washington, DC: National Council for Science and the Environment.
