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, pillows and sleeping bags.
The discovery of feathers trapped in ancient amber suggests that some species of non-avian dinosaur likely possessed down-like feathers.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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