BirdAn endothermic vertebrate that has

feathers, a four chambered heart and lays eggs

Contour Feather

A large feather that helps give shape to a bird’s body

Down Feather

A short fluffy feather that traps heat and keeps a bird warm

CropA bird’s internal storage pouch that

allows it to store food inside its body after swallowing it

GizzardA muscular thick walled part of the bird’s stomach that squeezes and

grinds partially digested food

LiftThe difference in pressure between the upper and lower surfaces of a bird’s wing that allows a bird to fly

MammalAn endothermic vertebrate with a

four chambered heart, skin covered with fur or hair, young feed from

milk produced by the female.

Mammary Gland

The organ in female mammals that produces milk for the mammal’s

young

DiaphragmA large muscle located at the

bottom of a mammal’s rib cage that functions in breathing

Monotreme A mammal that lays eggs

MarsupialA mammal’s whose young are born

alive but mature inside of the female’s pouch

Gestation Period

The length of time between fertilization and birth of a mammal

Placental Mammal

A mammal that develops inside its mother’s body until its body

systems can function independently

PlacentaA membrane that becomes the link

between the developing embryo and the mother

Zoology The study of animals