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| an endothermic vertebrate that has feathers and a four-chambered heart, and lays eggs |
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| a large feather that helps give shape to a bird's body |
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| a short fluffy feather thta traps heat and keeps a bird warm |
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| a bird's ineranl storage pouch that allows it to store food inside its body after swallowing it |
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| a muscular, thick-walled part of a bird's stomach that squeezes and grinds partially digested food |
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| an endothermic vertebrate with four chambered heart, skin covered with fur or hair and young fed with milk from the mother's body |
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| an organ in female mammals that produces milk for the mammal's young |
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| a large muscle located at the bottom of a mammal's rib cage that functions in breathing |
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| a mammal whose young are born alive at an early stage of development and which usually continue to develop in a pouch on their mother's body |
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| the length of time between fertilization and birth of a mammal |
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| a mammal that develops inside its mother's body unitl its body systems can function by themselves |
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| a membrane that becomes the link between the developing embryo or fetus and the mother |
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