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Most birds moult twice a year, resulting in a breeding or nuptial plumage and a basic plumage. Many ducks and some other species such as the red junglefowl have males wearing a bright nuptial plumage while breeding and a drab eclipse plumage for some months afterward.
Males in nuptial plumage are distinguished from green-winged teals by the horizontal white scapular stripe, the lack of a vertical white bar at the breast sides, and the quite conspicuous light outlines of the face patch, which are indistinct in the green-winged teal drake. Males in eclipse plumage, females and immatures are best recognised by ...
There are, for example, numerous terms describing the complex structural makeup of feathers (e.g., barbules, rachides and vanes); types of feathers (e.g., filoplume, pennaceous and plumulaceous feathers); and their growth and loss (e.g., colour morph, nuptial plumage and pterylosis). There are thousands of terms that are unique to the study of ...
This has a patchy or spotty appearance, with a mixture of blue and grey feathers on the head, and black and grey on the breast; birds born early in the breeding season will gain more nuptial plumage initially than those born late. Most perfect their nuptial moult by their second spring, though some may need another year. [19]
All sexually mature males moult twice a year, once before the breeding season in winter or spring, and again afterwards in autumn; rarely, a male may moult directly from nuptial to nuptial plumage. [28] The breeding males' blue plumage, particularly the ear-coverts, is highly iridescent due to the flattened and twisted surface of the barbules. [30]
The secretarybird is instantly recognizable as a very large bird with an eagle-like body on crane-like legs that give the bird a height of as much as 1.3 m (4 ft 3 in). The sexes are similar in appearance. Adults have a featherless red-orange face and predominantly grey plumage, with a flattened dark crest and black flight feathers and thighs.
These birds exhibit sexual dimorphism, and plumage also varies seasonally. During breeding or "nuptial" season, the male has a black beak, a small patch of black skin in front and behind the eyes (making the eyes look oval in shape), and brown wings. The rest of the plumage is a brilliant red to orange in color.
The Nile Valley sunbird (Hedydipna metallica) is a species of bird in the family Nectariniidae. It is found in Djibouti, Egypt, Eritrea, Ethiopia, Rwanda, Oman, Saudi Arabia, Somalia, Sudan, Libya, and Yemen. In February, the male Nile Valley sunbird assumes his nuptial plumage which he displays in flamboyant fashion.