Across
- 5. No longer existing
- 7. Found on birds, they help them fly
- 8. Something that is evident
- 12. To act like something else
- 13. A behavior caused by a stimulus
- 14. A group of animals that live on land and in the water
- 16. A hard outer covering that supports and protects some animals
- 18. To shed an outer covering
- 19. Organs for breathing
Down
- 1. The main bone that runs along the middle of the back
- 2. A simple, automatic behavior
- 3. A behavior that an animal is born with
- 4. A place where an animal lives
- 6. Animals that have hair and fur
- 9. Colors, shapes, and patterns that help you blend in
- 10. The way a living thing acts
- 11. Your surroundings
- 15. Animals that have dry, scaly skin
- 16. Having a population that is falling
- 17. The cause of a behavior