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15 Cards in this Set

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