1. Reptiles
1.1. Lizard
1.1.1. walks on four legs
1.1.2. eats plants and bugs
1.1.3. covered in scaly skin
1.1.4. lays eggs
1.1.5. cold-blooded
2. Amphibians
2.1. Frog
2.1.1. begins it's life in water
2.1.2. moves by walking or hopping
2.1.3. has two arms and two legs
2.1.4. eats plants and bugs
2.1.5. lays eggs in the water
2.1.6. cold-blooded
3. Birds
3.1. Flamingo
3.1.1. covered in feathers
3.1.2. moves by walking to flying
3.1.3. has two wings and two legs
3.1.4. has a beak
3.1.5. lives in warm regions
3.1.6. warm-blooded
4. Mammals
4.1. Polar Bear
4.1.1. covered in fun
4.1.2. walks on four legs
4.1.3. eats meat
4.1.4. lives in cold regions
4.1.5. breathes air using lungs
5. Fish
5.1. Shark
5.1.1. Swims in water
5.1.2. eats other fish
5.1.3. lives in the ocean
5.1.4. has fins
5.1.5. breathes using gills
5.1.6. cold-blooded
6. Insects
6.1. Bee
6.1.1. has an exoskeleton
6.1.2. flys with wings
6.1.3. walks with several legs
6.1.4. eats nectar and pollen
6.1.5. live in bee hives
6.1.6. cold-blooded