Analysis suggests that the cold-blooded ancestors of mammals evolved faster metabolisms in the Late Triassic period, roughly 230 million to 200 million years ago.
, Ricardo Araújo, a palaeontologist at the University of Lisbon, and his colleagues propose that the shape and size of the bony canals of the inner ear could be used as a proxy for body temperature. The movement of fluid through the canals helps the body to monitor head position and motion, which is essential for vision and balance. And the fluid’s viscosity changes with body temperature.
The authors conclude that this adaptation gave early endotherms an advantage in dealing with the Triassic climate, which was cooler than that of the preceding Permian period.
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