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The first starts a few days after fledging replacing the juvenile plumage with an auxiliary formative plumage; the second a month or so later giving the formative plumage. [3] Abnormal plumages include a variety of conditions. Albinism, total loss of colour, is rare, but partial loss of colours is more common.
In some birds, a partial molt occurs before the bird breeds. This plumage is known as the alternate plumage and is generally what was previously known as a bird's breeding plumage. If a bird produces a third plumage in addition to the basic and alternative, it is known as supplemental plumage. This plumage is most frequently found in ptarmigans ...
The supercilium is a plumage feature found on the heads of some bird species. It is a stripe which runs from the base of the bird's beak above its eye, finishing somewhere towards the rear of the bird's head. [1] Also known as an "eyebrow", [1] it is distinct from the eyestripe, which is a line that runs across the lores, and continues behind ...
Birds of prey such as hobbies and falcons, as well as rodents and tree-climbing snakes, also cause major damage to the clutches by taking eggs and nestlings. In subtropical areas where food is available throughout the year, tawny frogmouths sometimes start brooding earlier in winter to avoid the awakening of snakes after brumation.
The soft-plumaged petrel is a medium-sized petrel. Its plumage is dark grey and white, and its wings are narrow and with a pointed tail distinct in flight. It has a dark grey head with prominent white feathers on the cheeks and throat. There is a white speckling on forehead along with a prominent dark eye patch.
Birds appear to moult once a year in spring or summer, although observations have been limited. [24] Young birds spend about a year in juvenile plumage before moulting into adult plumage at around a year old. [25] Juvenile birds have more brown-tinged and uniform plumage; the darker colour around the lores and eyes are less distinct. [26]
The breeding male is a duller version of the female. They have lobed toes to assist with their swimming. Young birds are grey and brown above, with buff underparts and a black patch through the eye. In winter, the plumage is essentially grey above and white below, but the black eyepatch is always present.
The body length of the grandala is 20.5-23 cm, and it weighs from 38 to 52 g. The plumage of the male is blue-gray, only the tail and wings are black. The plumage of the female is brownish with white stripes; rump gray-blue; the tip and underside of the wing feathers are white. Birds usually make the sounds "dew-ee" and "dewee".