Across
- 2. - Humans have mouths, Birds have...
- 4. - Most of the animals lay them
- 6. - considered the most interesting group of animals because some can live on land and in water at the same time
- 8. - The name of this group means an animal that crawls or moves on its belly.
- 9. - Most of the mammals are covered with it
- 11. - People can do it underwater just for a short time
Down
- 1. - Humans are in this animal group
- 3. - it keeps birds warm
- 5. - The fish's body is covered with it
- 7. - Only this group of animals can fly
- 9. - Their meat includes a high level of protein
- 10. - Birds lay eggs in it