Across
- 2. uses gills to breathe
- 6. has wings and feathers
- 7. has damp skin, lays eggs
- 9. resting in the winter
- 10. has backbone
- 11. cold-blooded, lives on land
- 12. one of the groups of invertebrates
Down
- 1. smallest classification group
- 3. no backbone
- 4. fly to a warmer or cooler climate
- 5. one of the groups of invertebrates
- 7. jointed legs
- 8. gives live birth, has fur
- 13. largest classification group