This reflects the lower surface area to volume ratio in large animals, which reduces rates of heat loss.
While extant mesotherms are relatively rare, good examples include tuna, lamnid sharks (e.g., the great white shark), the leatherback sea turtle, some species of bee,[4] naked mole rats, hyraxes, and echidnas.
Historically, the same word was used by de Candolle to describe plants that require a moderate degree of heat for successful growth.
The term 'mesothermy' was originally coined[6] to advocate for an intermediate status of non-avian dinosaur thermoregulation, between endotherms and ectotherms.
Recently, a study of theropod and sauropod isotopes[11] offered some support for dinosaur mesothermy.