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| animal that eats only other animals or the remains of other animals |
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| strong, lightweight feathers that give birds their coloring and shape and that are used for flight |
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| soft, fluffy feathers that provide an insulating layer next to the skin of adult birds and that cover the bodies of young birds |
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| vertebrate animal with a nearly constant internal temperature |
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| period during which an embryo develops in the uterus |
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| animal that only eats plants or parts of plants |
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Definition
| endothermic vertebrates that have hair, teeth, specialized for eating certain foods, and mammary glands |
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| glands of mammals; in females, produce milk to feed their young |
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| a mammal with an external pouch for the development of its immature young |
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| a mammal that lays eggs with tough, leathery shells and whose mammary glands do not have nipples |
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| animal that eats plants and animals or animal flesh |
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| an organ that develops from tissues of the embryo and tissues that line the inside of the uterus and that absorbs oxygen and food from the mother's blood |
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| a mammal whose offspring develop inside the female's uterus |
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| process in which a bird rubs oil form an oil gland over its feathers to condition them |
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| connects the embryo to the placenta |
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