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GWMMS Birds Ch. 12

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Question
Answer
bird   An endothermic vertebrate that lays eggs and has feathers and a four-chambered heart.  
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contour feather   A large feather that helps give shape to a bird’s body.  
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down feather   A short, fluffy feather that traps heat and keeps a bird warm.  
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crop   An internal organ of many birds that stores food.  
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gizzard   A muscular, thick-walled part of a bird’s stomach that squeezes and grinds partially digested food.  
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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.  
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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.  
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diaphragm   A large muscle located at the bottom of a mammal’s rib cage that functions in breathing.  
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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.  
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placental mammal   A mammal that develops inside its mother’s body until its body systems can function independently.  
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mammary gland   An organ in female mammals that produces milk for the mammal’s young.  
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monotreme   A mammal that lays eggs.  
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gestation period   The length of time between fertilization and birth of a mammal.  
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placenta   An organ in pregnant placental mammals that passes materials between the mother and the developing embryo.  
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