It is called preening.
Moulting.
Disease - birds do not normally loose their feathers. When they change them it is called moult. Moulting is a process (like shedding in mammals) done regularly by birds, to replace old feathers with new, healthy feathers. This is normal. When a bird loses many feathers at once, it is usually due to the bird plucking out its own feathers OR a condition called French Moult, for which there is no cure.
Disease - birds do not normally loose their feathers. When they change them it is called moult.Moulting is a process (like shedding in mammals) done regularly by birds, to replace old feathers with new, healthy feathers. This is normal. When a bird loses many feathers at once, it is usually due to the bird plucking out its own feathers OR a condition called French Moult, for which there is no cure.All birds may or may not lose their feathers. It is only when this happens to them and or they die.
Most baby birds are born with feathers called 'down'.
Birds
yes infact the penguin doesn't have feathers But they do. All birds have feathers of some sort.
Yes. All birds lose feathers in the natural process ofmolting(replacing worn-out feathers with new ones by shedding them and growing new ones). Birds can also lose feathers by near escapes with predators.
They are called Down Feathers. Why, I have no idea.
The feathers on top of a peacock's head are called a "head crest"
Contour feathers. Wait: I was wrong. The answer is remiges.
Preening
Since bluebirds are birds, they are born with feathers but they are a special kind called down.