Noun
endothermy (uncountable)
(biology) A form of thermoregulation in which heat is generated by the organism's metabolism
Evidence of endothermy in Mesozoic dinosaurs includes the discovery of polar dinosaurs in Australia and Antarctica as well as analysis of blood-vessel structures within fossil bones that are typical of endotherms. Source: Internet
Some writers restrict the meaning of endothermy to mechanisms that directly raise the animal's metabolic rate in order to produce heat. Source: Internet