Canto y paricularidades del Degollado/Picogrueso Pechirrosa.
Song and peculiarities of the Rose-breasted Grosbeak
The rose-breasted grosbeak (Pheucticus ludovicianus) is a large, seed-eating grosbeak in the cardinal family (Cardinalidae). It is primarily a foliage gleaner.[2] Males have black heads, wings, backs, and tails, and a bright rose colored patch on their white breast. Males and females exhibit marked sexual dimorphism.
Breeding habitat consists of cool-temperate open deciduous woods throughout much of eastern North America, with migration to tropical America in winter. Rose-breasted grosbeaks have an average maximum lifespan of 7.3 years in the wild, and up to 24 years in captivity. Death in the wild is generally due to collision with objects (buildings, cars, etc) and predation, to eggs, nestlings and adults.
Adult birds are 18–22 cm (7.1–8.7 in) long, span 29–33 cm (11–13 in) across the wings and weigh 35–65 g (1.2–2.3 oz).[9][10] Grosbeaks measured during migration in the West Indies averaged 43 g (1.5 oz), while those banded in Pennsylvania average about 45 g (1.6 oz). Very little sexual dimorphism in size is seen; females were found to be marginally smaller in standard measurements, but in some seasons were marginally heavier than males when banded in Pennsylvania. At all ages and in both sexes, the beak is dusky horn-colored, and the feet and eyes are dark.
The adult male in breeding plumage has a black head, wings, back, and tail, and a bright rose-red patch on its breast; the wings have two white patches and rose-red linings. Its underside and rump are white. Males in nonbreeding plumage have largely white underparts, supercilium, and cheeks. The upperside feathers have brown fringes, and most wing feathers white ones, giving a scaly appearance. The bases of the primary remiges are also white. The coloration renders the adult male rose-breasted grosbeak (even while wintering) unmistakable if seen well.
The adult female has dark grey-brown upperparts – darker on wings and tail – a white supercilium, a buff stripe along the top of the head, and black-streaked white underparts, which except in the center of the belly have a buff tinge. The wing linings are yellowish, and on the upperwing are two white patches like in the summer male. Immatures are similar, but with pink wing-linings and less prominent streaks and usually a pinkish-buff hue on the throat and breast. At one year of age—in their first breeding season—males are scaly above like fully adult males in winter plumage, and still retain the immature's browner wings. Unlike males, females can easily be confused with the black-headed grosbeak (Pheucticus melanocephalus) where their ranges overlap in the central United States and south-central Canada. The rose-breasted grosbeak female has slightly darker brown markings on the underside, paler rather yellowish streaking on both the head and wings and paler, pinkish (rather than bi-colored) bill when compared to the female black-headed grosbeak.[16] A potential confusion species also is the female purple finch (Haemorhous purpureus), but that species is noticeably smaller with a less robust bill and a notched tail.
The song is a subdued mellow warbling, resembling a more refined, sweeter version of the American robin's (Turdus migratorius). Males start singing early, occasionally even when still in winter quarters. The call is a sharp pink or pick, somewhat reminiscent of a woodpecker call. Rose-breasted grosbeaks were the only one of 70 migratory songbird species in the eastern United States shown in males to have produced sperm while still far south of their breeding location.[21] Male grosbeaks tend to arrive a few days to a week before the females and pair formation apparently occurs on the breeding grounds.[22] Nest building begins from as early as early May in Tennessee to as late as early June further north in Saskatchewan. Egg laying may occur anytime from mid-May to mid-July, as has been recorded in Quebec.[25] Usually only a single brood is laid by these grosbeaks each summer but second broods are suspected in Canada and confirmed in semi-captivity. Both the male and the female apparently participate in selecting and building the nest, which is on a tree branch, over vines or any elevated woody vegetation.[28] Nests have been recorded at 0.8 to 16.7 m (2.6 to 54.8 ft) off the ground, averaging 6 m (20 ft) high, almost always in the vicinity of openings in woodlands.[29] Nests are typical of many passerines in both construct, material and size, made from leaves, twigs, rootlets or hair.[30] Clutches are from 1 to 5 eggs.
Attributes:
en.wikipedia.org/wiki/Rose-br...
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Viajes y eventos
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