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GWMMS Birds Ch. 12

bird An endothermic vertebrate that lays eggs and has feathers and a four-chambered heart.
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.
crop An internal organ of many birds that stores food.
gizzard A muscular, thick-walled part of a bird’s stomach that squeezes and grinds partially digested food.
lift The difference in pressure between the upper and lower surfaces of a bird’s wings that produces an upward force that causes the bird to rise.
mammal An endothermic vertebrate with a four-chambered heart and skin covered with fur or hair, that feeds its young with milk from the mother’s body.
diaphragm A large muscle located at the bottom of a mammal’s rib cage that functions in breathing.
marsupial A mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch on their mother’s body.
placental mammal A mammal that develops inside its mother’s body until its body systems can function independently.
mammary gland An organ in female mammals that produces milk for the mammal’s young.
monotreme A mammal that lays eggs.
gestation period The length of time between fertilization and birth of a mammal.
placenta An organ in pregnant placental mammals that passes materials between the mother and the developing embryo.
Created by: mrs-edgar