'A bird waterproofs its feathers with oil from its "preen gland", located at the base of this'
its tail
BIRDS: A bird waterproofs its feathers with oil from its preen gland, located at the base of this
A bird waterproofs its feathers with oil from its "preen gland", located at the base of this
A bird waterproofs its feathers with oil from its "preen gland", located at the base of this
BIRDS
its tail
BIRDS