a group of feathers on the head of birds.
a layer of small, fluffy feathers underneath the outer feathers of some birds.
distinctive markings which help in recognizing specific plants and animals.
a particular area where an animal lives, such as meadow, swamp, or forest.
the part of a bird's stomach that grinds food.
to prevent loss or absorption of heat or sound.
to move from one place to another with the change in seasons.
to clean clean the feathers with the beak (said of birds)
the hollow stem of a feather
the voice box of a bird