It is bored, under stress or needs more attention from you.
If you're bird is pulling out any feathers at all, make sure it is not stressed. Sometimes the bird is stressed. It could be from a harsh light, it being to cold/hot, or from being alone and neglected. Also, after mating there is a good chance any feathers will be pulled. A lot of times the bird is just preening itself and happens to pluck out a feather. It doesn't hurt them at all. It may even just seem like they are pulling out feathers, when they aren't. One just gets hit and falls out.
how the feathers protect the bird
As far as we know, there is no bird living without feathers.
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.
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.
Feathers that are on the neck of a bird.
A cocktail bird be fed once a week
Bird bones because feathers are very light and the bones just depend on the type of bird.
we are asking is there not a baby bird with yellow veins in its feathers
A vulture doesn't and I think a Condor also.