Free Science worksheets, Games and Projects Vertebrates: Animals which have a backbone. All vertebrates are either cold-blooded or warm-blooded. Mammals: Animals who feed their babies with milk from the mother's body. Amphibians: Animals who live in water and land. The study of amphibians and reptiles is called herpetology. Reptiles: Birds: ornithology, ornithologists Fish: The study of fish is called ichthyology. Scientists who study living things are called biologists The study of plants is called botany. Scientists who study plants are called botanists. The study of animals is called zoology. Scientists who study zoology are called zoologists. Fish, amphibians and reptiles are examples of cold-blooded animals. Warm-blooded animals are able to control their body temperature. No matter what the temperature is outside, their internal body temperature remains the same. Only birds and mammals are warm-blooded. Birds rely upon their feathers to help adapt to temperature changes.