Across
- 2. a bird's circulatory system has complete
- 5. What group became dominate about 215 mill years ago
- 7. food goes from the stomach/gizzard to the
- 10. snakes are what
- 11. dry scaly skin does not
- 12. it rely on behavior to help control body temp
- 15. medulla regulates
- 16. in feeding birds need a lot of
Down
- 1. what is the animal on the first page
- 3. and flight feathers are used for
- 4. food goes from the small intestine to the
- 6. birds regulate body temperature
- 7. scales can be rough or
- 8. reptiles live on
- 9. how many dinosaurs are on page 7
- 13. the discovery of the evolution of birds is
- 14. birds are believed to have evolved from