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10 Cards in this Set
- Front
- Back
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Contour feather |
strong, lightweight feathers that give a bird its coloring and smooth shape; used when flying. |
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Down feather |
soft, fluffy feathers that provide an insulating layer next to the skin of adult birds and cover the bodies of young birds. |
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Preening |
the process of a bird using its bill or beak to rub oil from a gland near its tail over its feathers; conditions the feathers and makes them last longer. |
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Mammary gland |
present in female mammals; produce milk for feeding their young. |
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Monotreme |
mammals that lay eggs with leathery shells; example: duck-billed platypus. |
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Marsupial |
mammals that give birth to immature young that usually crawl into an external pouch on the female’s abdomen; examples: kangaroos, opossums, and koalas. |
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Placental |
mammals in which embryos completely develop inside the female; examples: humans, bats, squirrels, wolves, apes, cows, dolphins and elephants. |
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gestation period |
the time during which the embryo develops |
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Umbilical cord |
made up of several blood vessels that transports food and oxygen from the placenta to the embryo and removes waste products from the embryo. |
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Detrivore |
an animal that eats dead or decaying material or animals |
