That is simple. Get rid of your cat. (or whatever else is killing the birds)
only if the bird had red feathers. the death of a red feathered bird calls for bad luck
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.
Ah, feathers. A beautiful thing, they are. They provide insulation by heat by trapping heat. If a bird is cold, it will generally fluff up it's feathers in order to capture heat. If it's cold, it'll slick them down to get rid of excess heat.
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.
They 'pren' their feathers
Feathers that are on the neck of a bird.
Bird bones because feathers are very light and the bones just depend on the type of bird.
I don't know, but I just saw one in my back yard in Boerne. Bright blue tail feathers.