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Blue-winged Warbler
The Blue-winged Warbler, Vermivora pinus, is a New World warbler, 11.5 cm long and weighing 8.5 g.. It breeds in eastern North America in southern Ontario and the eastern USA. Its range is extending northwards, where it is replacing the very closely related Golden-winged Warbler, Vermivora chrysoptera.
It is migratory, wintering in southern Central America.
It is a very rare vagrant to western Europe, with one bird wandering to Ireland.
The breeding male Blue-winged Warbler is unmistakable. It is yellow above and below. The wings are gray with two white bars, and there is a black eye stripe. Females are duller, but otherwise similar.
The breeding habitat is open scrubby areas. Blue-winged Warblers nest on the ground or low in a bush, laying 4-7 eggs in a cup nest.
These birds feed on insects, and spiders.
The song is a series of buzzing notes. The call is a sharp chip.
This species forms two distinctive hybrids with Golden-winged Warbler. The commoner, genetically dominant Brewster's Warbler is gray above and whitish (male) or yellow (female) below. It has a black eye stripe and two white wing bars.
The rarer recessive Lawrence's Warbler has a male plumage which is green and yellow above and yellow below, with white wing bars and the same face pattern as male Golden-winged. The female is gray above and whitish below with two yellow wing bars and the same face pattern as female Golden-winged.
Reference
New World Warblers by Curson, Quinn and Beadle, ISBN 0-7136-3932-6