A duck,pelican, or an albatross.
Crane
Also a swan
Just pick your favorite bird. They're all vertebrates, and almost all of them have feathers.
Birds, like crow(Corvus splendens)
A heron is one possibility.
Peacock (:
A duck!
A swan is an aquatic bird with white feathers
A penguin may be the most suitable answer, but a loon is a consideration.
An aquatic bird is basically called an aquatic bird.
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.
Another name for bird feathers is down.
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.
One bird described as "bald" because of the white feathers on its head is the American Bald Eagle, a protected species that is the official bird of the nation as a whole.
They 'pren' their feathers
Feathers that are on the neck of a bird.