1. Pisces: Exoskeleton of scales, endoskeleton of bone/cartilage, breathing through gills.
Eg: Fishes.
2. Amphibian: Gills in larva, lungs in most adults, shiny skin.
Eg: Amphibians.
3. Reptilia: Exoskeleton of scales, laying eggs outside water.
Eg: Reptiles.
4. Aves: Exoskeleton of feathers, lay eggs outside water, flight possible.
Eg: Birds.
5. Mammalia: Exoskeleton of hair, external ears, mostly giving birth to the young.
