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Type of heart a bird has

4-chambered

Air sacs

The oxygenated air inhaled by birds goes through the trachea and into these structures

Birds

These organisms share many characteristics with reptiles, like amniotic eggs and scales

Cerebellum

Part of the brain that coordinates movement and balance during flight

Contour feathers

Feathers that cover the body, wings and tail

Crop

Structure that stores food

Down feathers

Feathers that are soft, trap air and act as insulation

Endotherm

An organism that is able to generate its body heat internally by its own metabolism

Feathers

Structures that are specialized outgrowths of skin involved in flight and insulation

Gizzard

Structure that grinds food

Incubate

In the case of animals, to sit on eggs to keep them warm

Keratin

Fibrous protein that makes up feathers and hair

Medulla Oblongata

Part of the brain that controls automatic functions such as respiration and heartbeat

One-way circulation

Type of circulation in birds

Preen gland

Organ that secretes waterproofing oil for feathers

Uric acid

Wastes excreted by birds

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