Birds

A birds body is divided by head, neck, trunk, tail bones are lightweight and filled with air.
The 4 categories of birds are Flightless birds, water birds, perching birds, and birds of prey.
The feathers on a bird adapt by growing more if need be or losing some if need be.
The 3 main divisions of a bird's brain are the Cerrebellum, mid brain, and the cerebrum.  The cerrebellum controls flying and walking, the midbrain tectum is the center of vision.
Birds know where to migrate to because of instict and partly learned behavior.