The answer is grooming
Preen
plumage
on baby penguins, it is called down.
The feathers covering the body of a bird are typically called its plumage.
Plumage is what you would call a bird feathers. For example, the peacock has very beautiful, and colorful plumage.
how the feathers protect the bird
As far as we know, there is no bird living without feathers.
It's Called A Tic Tic Bird It Cleans All The Tics Of The Elephant
how the feathers protect the bird
It will not be able to fly with no feathers. Feathers keep a bird warm. If its feathers are gone it will die of cold. Most importantly feathers help a bird to escape from predators.
I believe it's preening
Down feathers are feathers that lie under a birds body and primary feathers. These feathers are small and puffy, and trap warm air under a bird's feathers.
Another name for bird feathers is down.