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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]
Feathered theropods are probably the best candidates for dinosaur endothermy, yet the examined theropods had relatively low body temperatures 32.0 °C (89.6 °F). Large sauropods had higher body temperatures 37.0 °C (98.6 °F), which may be reflective of mesothermic gigantothermy.
Skull of E. mirabilis. Estemmenosuchus could reach a body length of more than 3 m (10 ft). [2] Its skull was long and massive, up to 65 cm (26 in) in length, [2] and possessed several sets of large horns, somewhat similar to the antlers of a moose, growing upward and outward from the sides and top of the head.
The group that includes mammals and birds, both "warm-blooded" homeothermic animals (in red) is polyphyletic.. Homeothermy, homothermy or homoiothermy [1] is thermoregulation that maintains a stable internal body temperature regardless of external influence.
The common frog is a poikilotherm and is able to function over a wide range of body core temperatures.. A poikilotherm (/ ˈ p ɔɪ k ə l ə ˌ θ ɜːr m, p ɔɪ ˈ k ɪ l ə ˌ θ ɜːr m /) is an animal (Greek poikilos – 'various', 'spotted', and therme – 'heat') whose internal temperature varies considerably.
[228] [229] Sauropods may also have benefitted from their size—their small surface area to volume ratio meant that they would have been able to thermoregulate more easily, a phenomenon termed gigantothermy. [141] [230]
B. baini B. seeleyi. Bradysaurus was 2.5–3 m (8 ft 2 in – 9 ft 10 in) in length [1] and half a tonne to a tonne in weight. The skull was large (about 42 to 48 centimeters long), broad and rounded at the front.
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