An endotherm is an animal that generates heat in order to maintain its body temperature, another name for these creatures are warm-blooded animals. They generate heat by using metabolic energy. Endotherms are the opposite of ectotherms because they have a body temperature that is usually warmer than their environment, while ectotherms have a body temperature colder than their environment. Endotherms include mammals, birds, and some fishes and insects. A bobcat is a common example in Florida of an endotherm.