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Foth re-interpreted stage 2 feathers as crushed or misidentified feathers of at least stage 3, and stage 5 feathers as crushed stage 6 feathers. [ 111 ] The following simplified diagram of dinosaur relationships follows these results, and shows the likely distribution of plumaceous (downy) and pennaceous (vaned) feathers among dinosaurs and ...
English: Diagram showing the stages of feather evolution as outlined by Xu & Gou 2009. Single filament; Multiple filaments joined at their base; Multiple filaments joined at their base to a central filament; Multiple filaments along the length of a central filament; Multiple filaments arising from the edge of a membranous structure
Red kite (Milvus milvus) in flight, showing remiges and rectrices. Flight feathers (Pennae volatus) [1] are the long, stiff, asymmetrically shaped, but symmetrically paired pennaceous feathers on the wings or tail of a bird; those on the wings are called remiges (/ ˈ r ɛ m ɪ dʒ iː z /), singular remex (/ ˈ r iː m ɛ k s /), while those on the tail are called rectrices (/ ˈ r ɛ k t r ...
Feather development occurs in the epidermal layer of the skin in birds.It is a complicated process involving many steps. Once the feathers are fully developed, there are six different types of feathers: contour, flight, down, filoplumes, semiplumes, and bristle feathers.
The skeleton of a bird wing. Places of attachment of various groups of flight feathers are indicated. The mute swan with outstretched wings Wing of the white-tailed eagle. Bird wings are a paired forelimb in birds. The wings give the birds the ability to fly, creating lift. Terrestrial flightless birds have reduced wings or none at all (for ...
A covert feather or tectrix on a bird is one of a set of feathers, called coverts (or tectrices), which cover other feathers. The coverts help to smooth airflow over the wings and tail. The coverts help to smooth airflow over the wings and tail.
The barbules maintain the shape and function of the feather. Each feather has a major (greater) side and a minor (lesser) side, meaning that the shaft or rachis does not run down the center of the feather. Rather it runs longitudinally off the center with the lesser or minor side to the front and the greater or major side to the rear of the ...
This resulting covering of feathers, which will last either until the next breeding season or until the next annual moult, is known as the basic plumage. Many species undertake another moult before the breeding season known as the pre-alternate moult , the resulting breeding plumage being known as the alternate plumage or nuptial plumage.