Another name for bird feathers is down.
down
lophophorous
lophophorous
The scientific name for a feather is a feather. however the feathers on a bird are called its "plumage".
Royal cloaks were made of bird feathers. Queen Ka'ahumanu's name means cloak of bird feathers.
Goose down quilts are filled with bird feathers, thus the name.
Down feathers.
pelican
Yes, a whiteback is another name for the canvasback. This is a species of duck found in North America, and has white-gray feathers on its back.
how the feathers protect the bird
As far as we know, there is no bird living without feathers.
how the feathers protect the bird