Down feathers for birds are like there Heating and AC in your house. If there to cold they will fluff up their feather and allow air to come in and get trapped and warmed. Too warm they will stay sleek and create cool air by flapping there wings or taking a bath.
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Because the feathers is warm
Down feathers help insulate the body of a bird.
Down feathers are used to give the birds body shape. Also they have a "soft" flexible bone.
All birds have down feathers, which keep them warm.
a bird flew by
a bird flew by
I think it was Downy (Down being the soft feathers on a bird)
It anchors down the bird's flight muscles.
When ducks are adults, you can look for the easy to tell "sex" feather on a male. This is a feather at the top of the base of the tail that has a curl in it. It curls down towards the birds back. If the bird is a male it will have this sex feather.
Yes, the extra water weight weighs the bird down in flight.
You probably mean down, but down is not a feather, it is down.
Sleeping bags are made of synthetic or cotton or wool or down (bird's under layer of feather) materials.
The term pillows down means the type of material they use for the filling of the pillow. Down is a type of feather that is found on the bottom layers of bird feathers.