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15 Cards in this Set
- Front
- Back
Keeping eggs warm until they hatch
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incubate
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gives birds their coloring and smooth, sleek shape. The bird uses them to fly.
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contour feathers
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provide an insulating layer next to the skin of adult birds and covers the bodies of young birds.
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down feathers
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Using its beak, the bird rubs oil from the gland over its feathers
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preening
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endothermic vertebrates that have hair and produce milk to feed their young
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mammals
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produce the milk females use to feed their young
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mammary gland
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animals that eat plants
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herbivore
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flesh-eating animals
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carnivores
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eat both plants and animals
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omnivores
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lay eggs with tough, leathery shells
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monotremes
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pouched animals that give birth to tiny immature offspring
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marsupials
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embryos develop inside the female in the uterus
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placental mammals
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the time during which the embryo develops in the uterus
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gestation period
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this attaches the embryo to the placenta
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umbilical cord
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a saclike organ developed by the growing embryo that attaches to the uterus
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placenta
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