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This in turn, raises its body temperature to 37.5 °C (99.5 °F), compared to 31.7 °C (89.1 °F) when present in other habitats. [2] Its body temperature is also observed to be more stable. [2] On the other hand, burrows without birds did not provide this heat, being only 28 °C (82 °F). [2]
In addition, mesotherm body temperatures tend to rise as body size increases (a phenomenon known as gigantothermy [3]), unlike endotherms. This reflects the lower surface area to volume ratio in large animals , which reduces rates of heat loss.
Gigantothermy (sometimes called ectothermic homeothermy or inertial homeothermy) is a phenomenon with significance in biology and paleontology, whereby large, bulky ectothermic animals are more easily able to maintain a constant, relatively high body temperature than smaller animals by virtue of their smaller surface-area-to-volume ratio. [1]
Warm-blooded is a term referring to animal species whose bodies maintain a temperature higher than that of their environment. In particular, homeothermic species (including birds and mammals) maintain a stable body temperature by regulating metabolic processes. Other species have various degrees of thermoregulation.
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During these multi-day torpor bouts, body temperature drops to ~1 °C above ambient temperature and metabolism may drop to about 1% of the normal endothermic metabolic rate. Even in these deep hibernators, the long periods of torpor is interrupted by bouts of endothermic metabolism, called arousals (typically lasting between 4–20 hours).
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