Chapter 16 Birds And Mammals

Front 1

Keeping eggs warm until they hatch

Back 1

incubate

Front 2

gives birds their coloring and smooth, sleek shape. The bird uses them to fly.

Back 2

contour feathers

Front 3

provide an insulating layer next to the skin of adult birds and covers the bodies of young birds.

Back 3

down feathers

Front 4

Using its beak, the bird rubs oil from the gland over its feathers

Back 4

preening

Front 5

endothermic vertebrates that have hair and produce milk to feed their young

Back 5

mammals

Front 6

produce the milk females use to feed their young

Back 6

mammary gland

Front 7

animals that eat plants

Back 7

herbivore

Front 8

flesh-eating animals

Back 8

carnivores

Front 9

eat both plants and animals

Back 9

omnivores

Front 10

lay eggs with tough, leathery shells

Back 10

monotremes

Front 11

pouched animals that give birth to tiny immature offspring

Back 11

marsupials

Front 12

embryos develop inside the female in the uterus

Back 12

placental mammals

Front 13

the time during which the embryo develops in the uterus

Back 13

gestation period

Front 14

this attaches the embryo to the placenta

Back 14

umbilical cord

Front 15

a saclike organ developed by the growing embryo that attaches to the uterus

Back 15

placenta