| A | B |
|---|
| vertebrates | animals with a backbone |
| invertebrates | animals with NO backbone |
| mammals | feed babies from their bodies |
| flukes | tail fins for moving through the water |
| cow | grown-up female dolphin or whale |
| flippers | side fins that steer up or down, left or right |
| blowholes | used by whales and dolphins to breathe air |
| echolocation | using sound waves to locate things |
| krill | tiny creatures eaten by humpback whales |
| pod | a group of dolphins that travels together |
| baleen | used by some whales to strain food from seawater |
| blubber | deep layer of fat under skin |
| bull | grown-up male dolphin or whale |
| cetaceans | whales and dolphins are some of these |
| calf | baby dolphin or whale |
| mackerel | a kind of fish |
| orcas | also called killer whales |
| cold-blooded | creatures like fish whose body temperatures changes with cold or heat |
| warm-blooded | creatures such as dolphins and humans whose body temperature stays about the same even when it's very cold or hot |
| Arctic | cold area near the North Pole where northern whales go during summer |
| Antarctic | cold continent near South Pole where southern whales go during summer |
| blue whale | biggest animal that has ever lived on earth |
| narwhal | has one very long tusk |
