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The underlying molecular and genetic mechanisms that are responsible for crest feather formation in domesticated bird species are not well understood. As such, crest feathers are widely studied in morphological research and other related biological disciplines, particularly concerning domesticated species. [5]
Crested auklets are known for their forehead crests, which is made of black forward-curving feathers. These forehead crests are highly variable, and can have between two and twenty three narrow forward curving feathers. The average auklet has 12 crest feathers, which are of variable length, between 8.1 and 58.5 millimetres. [10]
A skull excavated in England suggests that crested chickens were present there in Roman times. [1] [2] Early depictions of these birds are found in the Ornithologiae tomus alter of Ulisse Aldrovandi of 1600, and in the work of Dutch animalier painters such as Melchior d'Hondecoeter in the later seventeenth century.
The long-crested eagle (Lophaetus occipitalis) is an African bird of prey characterised by its shaggy crest of feathers. In the family Accipitridae which includes all the eagles, it is currently placed in a monotypic genus Lophaetus. It is found throughout mid- and southern Africa, with differing home ranges due to food availability and ...
Adult crested bobwhite are about 178 to 216 millimetres (7.0 to 8.5 in) long. The sexes are very similar in appearance. The long feathers on the fore-head and crown are pale buff or white, and the crest feathers may be dark. The back and sides of the neck are marbled in black and white and the throat is white or buff, sometimes spotted with black.
The crested eagle has a large head, an effect enhanced by the often extended feather crest of its name. It has bare legs, with a sizable tarsus length of 10.3 to 11.2 cm (4.1 to 4.4 in). The tail is fairly long, measuring 34 to 43 cm (13 to 17 in) in length, in part accounting for the considerably low weights cited for an eagle of this size.
Their bare facial skin and legs are yellow. Crest feathers appear at 21 days, and flight feathers by 28 days. They can stand up and feed autonomously after 40 days, although the parents still feed the nestlings after that time. At 60 days, the now fully-feathered young start to flap their wings.
The western crowned pigeon (Goura cristata), also known as the common crowned pigeon or blue crowned pigeon, is a large, blue-grey pigeon with blue lacy crests over the head and dark blue mask feathers around its eyes. Both sexes are almost similar but males are often larger than females.