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The Black-throated Green Warbler, Dendroica virens, is a small songbird of the New World warbler family.

It is 12 cm long and weighs 9 g, and 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.

Their breeding habitat is coniferous and mixed forests in eastern North America and western Canada, also cypress swamps on the southern Atlantic coast. The nest is an open cup usually placed close to the trunk.

These birds migrate to Mexico, Central America, the West Indies and southern Florida.

Black-throated Green Warblers forage actively in vegetation, sometimes hovering or catching insects in flight. They mainly eat insects, especially caterpillars, also some berries during migration.

The song of this bird is a buzzed zee-zee-zee-zooo-zeet or zoo-zee-zoo-zoo-zeet. The call is a sharp tsip.

This bird is vulnerable to nest parasitism by the Brown-headed Cowbird.

References

* Curson, Quinn and Beadle,New World Warblers ISBN 0-7136-3932-6
* Stiles and Skutch, ''A guide to the birds of Costa Rica’’ ISBN 0-0814-9600-4