Endotherms usually, though not always, maintain a constant body temperature that is higher than that of the environment.
An endotherm is an organism that keeps its body at a metabolically favorable temperature, primarily by using heat produced by internal bodily functions rather than relying almost entirely on ambient heat. Endothermic animals must generate their own heat in order to maintain an optimal body temperature.
Shivering is an example of a special-function muscular exertion, as is uncoupled oxidative metabolism within brown adipose tissue. Only birds and mammals are known to be universally endothermic animal groups. Endothermic species include the Argentine black and white tegu, leatherback sea turtles, lamnid sharks, tuna and billfishes, cicadas, and winter moths.
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