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GWMMS Birds Ch. 12
Question | Answer |
---|---|
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. |