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DOWN FEATHER

Fluffy, insulating feathers that lie next to bird's body

CONTOUR FEATHER

Made of stiff central shaft with many side branches & Cover the body and wings of birds to form a streamlined flying surface

CROP

Internal organ in birds that stores food

LIFT

Upward pressure on the wing that keeps a bird in the air

GIZZARD

Internal organ in birds that grinds food

MAMMARY GLANDS

Found in mammals, an organ in mother's body that produces nutritious milk

DIAPHRAGM

Large muscle under mammals' lungs to help bring air into them

MONOTREME

Mammals that lay eggs

MARSUPIALS

Mammals with pouches

GESTATION PERIOD

Length of time between fertilization and birth

CARNIVORE

Meat eater

HERBIVORE

Plant eater

INSECTIVORE

Insect eater

OMNIVORE

Meat and plant eater

PLACENTAL MAMMALS

Mammals that have embryos that develop in mother's uterus until its body systems can function independently

PRIMATES

A group of mammals that have opposable thumbs and binocular vision

BIRD

An endothermic vertebrate that has feathers, a four-chambered heart, and lays eggs

MAMMAL

An endothermic vertebrate that has a four-chambered heart, skin covered with fur or hair, and young fed by mother's milk

PLACENTA

Found in mammals, an organ in pregnant female mammals that passes materials such as food, oxygen and wastes between the mother and the developing embryo

AIR PRESSURE

Air molecules pushing

UNGULATE

A mammal having hooves

HOOF

A modified toenail

HETERODONT

A mammal with specialized teeth

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