It “eclipses” his usual bright plumage.
On this basis, he discovered that all young jacobins, regardless of sex, sport male-like plumage.
“With its noisy chattering, black and white plumage, and long tail, there is nothing else quite like the magpie in the UK.”
Their winter plumage is black, grey and white but in spring they moult into their breeding plumage with a rich chestnut throat and belly and golden ear-tufts.
Plumage, collective feathered covering of a bird.
These birds begin to get a dull plumage by early June.
Coloration is hereditary, and gray plumage is dominant.
The white-spotted plumage may be mainly red, yellow, or gray.
Touches of bright red on the plumage or on bare parts are not infrequent.
Plumules are present in young birds before they develop the adult plumage.
In winter plumage, most grebes are brown, black, or gray above and white or light brown below.
First, the team had to devise a way to deal with the 11,966 types of plumage they had set out to examine.
Bright plumage is associated with high testosterone levels; however, testosterone itself appears to suppress the immune system.
Passerines often are sexually dimorphic in their plumage, with adult males wearing brighter colours and more striking patterns than do females.
The secretion of this gland contains approximately one-half lipids (fats and oils) and is probably important in dressing and waterproofing the plumage.
As might be expected, stuffed females in female plumage received a lot of sexual attention from males, whilst those in male plumage were spared.
Many songbirds adopt a bright, contrasting nuptial plumage during the breeding season, reverting to a drabber winter plumage during the postnuptial molt.
Among birds, meanwhile, analysis of the largest order (passerines, or song birds, which are 60% of bird species) showed that the proportion of specimens of a species that were male was directly related to how showy that species’ male plumage was compared to the plumage of its females.
Cultural evolution, in other words, is generating conformity in the same sort of way that biological evolution does when the plumage of a male bird has to conform to female expectations of what a male looks like if that male is to mate successfully, even though the particular pattern of his plumage brings no other benefit.
A typical series of molts and plumages would be juvenal plumage, postjuvenal (also called first prebasic) molt, first winter (or first basic) plumage, first prenuptial (or pre-alternate) molt, first nuptial (or alternate) plumage, first postnuptial (first annual, or second prebasic) molt, second winter (or basic) plumage, etc.
plumage
noun animal
- the light horny waterproof structure forming the external covering of birds
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A typical series of molts and plumages would be juvenal plumage postjuvenal also called first prebasic molt first winter or first basic plumage first prenuptial or pre-alternate molt first nuptial or alternate plumage first postnuptial first annual or second prebasic molt second winter or basic plumage etc