Across
- 2. Animals that make their own heat.
- 5. The "big change" that most amphibians and some invertebrates go through.
- 8. What fish and some amphibians have so they can breathe in water.
- 9. The skin covering of reptiles and fish that protects them.
- 11. What mammals feed their babies to help them grow.
- 13. Cold-blooded animals that live almost everywhere and have no inside skeletons.
Down
- 1. Animals that can't make their own heat.
- 3. What birds are covered with to keep them warm and help them fly or swim.
- 4. Cold-blooded animals with slimy skin that live on land or in water.
- 6. A soft or hard shell that protects the babies of some animals as they grow.
- 7. Cold-blooded animals with scales that live and breathe in water
- 10. Cold-blooded animals with scales that lay eggs.
- 12. Warm-blooded animals with hair or fur that give their babies milk.
- 14. Warm-blooded animals with feathers that lay eggs.