| A | B |
|---|
| mammal | a warm-blooded animal that nurses its young, has a backbone and hair |
| echolocation | a system in some animals for locating objects using sound waves |
| ecosystem | the environment in which living things live |
| nectar | a sweet liquid made by flowers |
| nocturnal | the state of being active at night |
| roost | the place where animals such as bats and certain types of birds rest |
