| A | B |
|---|
| carnivores | such as tigers, are flesh-eating animals |
| cartour feathers | give birds their coloring and smooth, sleek shape. |
| down feathers | provide an insulating layer next to the skin of adult birds and cover the bodies of young birds. |
| gestation period | time during which the embryo develops in the uterus. |
| herbivores | animals like the rabbits that eat plants. |
| incubate | parents keep the eggs warm by sitting on them until they hatch |
| mammals | warm-blooded vertebrates that have hair and produce mild to feed their young.. |
| mammary glands | which are characteristics of all mammals, produce the milk female mammals use to feed their young. |
| mantoes | large mammals belonging to the order sirenia that live in salt waters. |
| marsupials | are pouched mammals that give birth to tiny, immature offspring. |
| monotremes | mammals that lay eggs with tough, leathery shells. |
| omnivores | eat both plants and animals. |
| placenta | an organ developed by the growing embryo that attaches to the uterus. |
| placental mammals | embryos develop inside an organ called the uterus. |
| poaching | illegal hunting |
| preening | using its beak, the bird rubs oil |
| umbilical cord | attaches the embryo to the placenta. |
| bird characteristics | warm-blooded; have feathers and scales; lay egs with a hard shell; incubate eggs (most do); front legs modified into wings; 2 hind legs support body and usually have claws. |
