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The down feather is considered to be the most "straightforward" of all feather types. [2] It has a short or vestigial rachis (shaft), few barbs, and barbules that lack hooks. [3] There are three types of down: natal down, body down and powder down. Natal down is the layer of down feathers that cover most birds at some point in their early ...
Down feathers are fluffy because they lack barbicels, so the barbules float free of each other, allowing the down to trap air and provide excellent thermal insulation. At the base of the feather, the rachis expands to form the hollow tubular calamus (or quill) which inserts into a follicle in the skin. The basal part of the calamus is without ...
In those species having powder down, signs may be visible immediately, as powder down feathers are continually replenished. It can also be expressed peracutely, ranging from sudden death, particularly in neonates, [ 33 ] to an acute form in nestling and fledglings, characterised by feather dystrophy , diarrhoea , weakness and depression ...
Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power, the more air a certain weight of the down can trap, and thus the more insulating ability the down will have.
When preening, a bird (such as this red lory) draws individual feathers through its beak, realigning and re-interlocking the barbules.. Preening is a maintenance behaviour found in birds that involves the use of the beak to position feathers, interlock feather barbules that have become separated, clean plumage, and keep ectoparasites in check.
The woodswallows, Artamidae, are among the few perching birds that have special feathers called powder down that break up into fine dust that is spread by the birds onto their body when preening. [11] Powder down is also found in the egrets. Members of the family have a brush-tipped tongue.
Related: Meg Ryan and Billy Crystal Recreate the Iconic Fake Orgasm Scene from When Harry Met Sally for Hellmann's 2025 Super Bowl Ad (Exclusive) He adds that his reaction to hearing these ...
Down feather#Powder down; This page is a redirect. The following categories are used to track and monitor this redirect: To a section: ...
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