Across
- 4. the highest part of the back at the base of an animal's neck
- 6. by surprise
- 8. the periodic passage of groups of animals
- 9. censure severely or angrily
- 10. any animal that lives by preying on other animals
- 11. uninterrupted in time and indefinitely long continuing
- 12. organisms interacting with their physical environment
- 13. move or swing from side to side regularly
Down
- 1. originating where it is found
- 2. subnormal body temperature
- 3. a smooth three-beat gait
- 5. a sudden forceful flow
- 7. run easily
- 8. a span of 1000 years
- 11. ground that is permanently frozen