1. CLASSIFYING ANIMALS

2. Classifying Animals Vertebrates: Animals with backbone. Invertebrates: Animals without backbone.

3. Vertebrates Fish: Covered with scales. Live in water. Gills. Cold-blooded. Lay eggs.

4. Vertebrates Amphibians: Covered with smooth skin. Live in water and land. Lungs or gills. Cold-blooded. Hatch from eggs.

5. Vertebrates Reptiles: Covered with scales. Live on land. Lungs. Cold-blooded. Lay eggs.

6. Vertebrates Birds: Covered with feathers. Live on land. Lungs. Warm-blooded. Lay eggs.

7. Vertebrates Mammals: Hair or fur. Lungs. Warm-blooded. They make milk to feed their young.

8. Invertebrates Most animals on Earth. Earthworms have soft bodies made of segments.

9. Invertebrates Arthropods: Largest group. Their legs and bodies are divides into sections. Covered by a hard, lightweight outer skin (exoskeleton).