Down feather

Like many precocial hatchlings, domestic chickens are already covered with a downy coat of feathers when they hatch.

Body down feathers, like these exposed on this adult male budgerigar's back, lie underneath the contour feathers and help to insulate birds against heat loss.

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.

单词	Neoptile
释义	Neoptile 英语百科 Down feather 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.
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Neoptile

Down feather