Across
- 2. part of a bird's digestive system that releases waste
- 5. mammal with a pouch for carrying developing young
- 6. rough organ to grind bird's food
- 8. claw-like feet
- 10. animal that take nutrients from a living host
- 11. organs for removing oxygen from water
- 13. warm-blooded animal with fur and mammary glands
- 16. animal with a backbone
- 17. early stage of an animal that undergoes metmorphosis
- 18. tail fin on an aquatic animal
- 20. animal that eats dead plants or animals
- 22. animal without a backbone
- 24. a type of extended period of sleep
Down
- 1. clear membrane that protect a reptile's eyes
- 2. animal that does not maintain a constant body temperature
- 3. sac that releases food continuously into the bird's stomach
- 4. flexible material replacing bone in some fish
- 7. animal that begins life breathing water and changes to be able to breathe air
- 9. animal that maintains a constant body temperature
- 12. tail with the ability to grasp
- 14. active at night
- 15. comb-like structures in a whale's mouth for straining food
- 19. animal that regurgitates and rechews its food
- 21. mammal with five fingers, five toes, and binocular vision
- 23. tube between the mouth and stomach