Replacement feathers are increasingly abnormal and birds may become bald as feather follicles cease to function.
(Replacement feathers; are; increasingly abnormal) (birds; may become; bald; T:as feather follicles cease to function) (feather follicles; cease; to function)
Replacement feathers birds feather follicles
are may become cease
increasingly abnormal
bald T:as feather follicles cease to function
to function