Passage I Some animals have backbones. Other animals do not. Animals that have backbones are called vertebrates. There are five groups of animals with backbones, An animal that is warm-blooded, has feathers, and lays eggs is called a bird. Mammals are a group animals that give live birth to their habies. Mammals have hair, breathe with lungs and ar warm-blooded. Animals that are cold-blooded, lay eggs, have scales and breathe with lungs are called reptiles. Fish are cold-blooded animals that breathe with gills. They have scales and live in the water. The last groups of animals with backbones are amphibians. They have slimy skin, lay eggs and are cold-blooded!