These birds feed on insects, and spiders. Both male and female adults have grayish-black legs and yellow soles; the young Warblers have dull pinkish gray legs (Frank, Canterbury, and Confer). All Blue-winged Warbler have blackish brown eyes and a body mass that ranges from 7.2 to 11 g. The Blue-winged Warblers are related to the Golden-winged Warblers. âPureâ (homozygous) Blue-winged Warblers are therefore wwPP, while âpureâ Golden-winged Warblers are WWpp. In fact, until the 1960's it was not known to occur as a breeder our state. Species: The Brewster's Warbler (Dendroica castanea) is a hybrid of the Golden-winged Warbler and the Blue-winged Warbler. A first generation Brewsterâs Warbler is a result of a pure Blue-winged Warbler and a pure Golden-winged Warbler, and has the genotype WwPp. One call sounds like âtzipp,â while the other sounds like âzzrrttt.â The âtzipp,â call is used as an alarming sound, and is usually used when the Blue-winged Warbler is engaged in a fight. Both age and sex of Blue-winged Warbler can usually be determined by overall plumage, with molt limits on the wing providing the most reliable indicator of age. The breeding habitat is open scrubby areas. Since 1698 they have decreased 66% ( Osgood, 2016 ). In the state of Connecticut, from 1966 to 2005, they have declined at a rate of 3.4% per year (Askins, 2011). Clockwise from upper left: golden-winged warbler, blue-winged warbler, chestnut-sided warbler, and ovenbird. Blue-winged Warblers nest on the ground or low in a bush, laying 4-7 eggs in a cup nest. The female is gray above and whitish below with two yellow wing bars and the same face pattern as female Golden-winged. The Blue-winged Warbler nests in the eastern United States and extreme southeastern Canada. Clockwise from upper left: Lucy's warbler, female yellow warbler, hermit warbler⦠Annually the Blue winged warbler have decrease d 4.4% in the south (Confer & Tupper, 2000). That is, we can think of them as each exhibiting one dominant trait. She then mated with a chestnut-sided warbler and successfully reproduced.â Video by a bird watcher and eBird user Lowell Burket of Roaring Spring, Pennsylvania, recorded a male bird that sang like a chestnut-sided warbler but had some of the physical characteristics of blue-winged and golden-winged warblers. The Blue-winged Warbler has both two different calls and two different songs. Vermivora warblers are smallish birds about 4" to 4.5" long; in addition to Blue-winged (above), in the eastern U.S. the genus includes Golden-winged (with which Blue-wings hybridize to produce Brewster's and Lawrence's), Tennessee, Orange-crowned, Nashville, and the now-extinct Bachman's Warbler.Three more Vermivora species occur exclusively in the West: Virginia's, Colima, and Lucy's Warblers. Diet / Feeding. The Lawrence's Warbler is another hybrid, but a second or third generation from the original parent birds. 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