<P> The down of birds is a layer of fine feathers found under the tougher exterior feathers . Very young birds are clad only in down . Powder down is a specialized type of down found only in a few groups of birds . Down is a fine thermal insulator and padding, used in goods such as jackets, bedding (duvets), pillows and sleeping bags . The discovery of feathers trapped in ancient amber suggests that some species of dinosaur may have possessed down - like feathers . </P> <P> The word down comes from the Old Norse word dúnn, which had the same meaning as its modern equivalent . The down feather is considered to be the most "straightforward" of all feather types . It has a short or vestigial rachis (shaft), few barbs, and barbules that lack hooks . 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 development . Precocial nestlings are already covered with a layer of down when they hatch, while altricial nestlings develop their down layer within days or weeks of hatching . Megapode hatchlings are the sole exception; they are already covered with contour feathers when they hatch . Body down is a layer of small, fluffy feathers that lie underneath the outer contour feathers on a bird's body . </P>

Where does the down in pillows come from
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