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In addition, this new character may have enabled them to survive the Permian-Triassic extinction event, 252 million years ago For how long have warm-blooded animals existed?
The time at which this character first appeared in the ancestors of mammals has long been debated.
Now, dating analyses carried out on 90 fossils by an international collaboration including the Laboratoire de Géologie de Lyon -- Terre, Planètes, Environnement (CNRS/ENS de Lyon/Université Claude Bernard Lyon 1) have shown that warm-blooded species first appeared among our ancestors during the Late Permian, 252 -- 259 million years ago.
Bowring’s team found evidence supporting this theory.
However, it did give them a good starting place to refine the search.
For the current study, the team collected samples from five ancient volcanic ash beds and compared the uranium isotopes.
Sandstones and volcanic deposits at Old Lootsberg Pass in South Africa’s Eastern Cape Province preserve fossil and geochronometric evidence suggesting that the Permian-Triassic terrestrial and marine extinctions were not simultaneous. The cataclysm, known as the Permian-Triassic (P-T) mass extinction, was likely driven by extensive flood basalt volcanism in Siberia and is thought to have affected global biodiversity simultaneously.
Life on land and in the sea was nearly eradicated about 252 million years ago in the largest-known mass extinction.The work is published in the journal Today, only birds and mammals are able both to produce their own body heat (this is known as endothermy) and maintain it at a high, stable temperature (homeothermy).The combination of both these characteristics, endo-homeothermy, first appeared in the therapsids, the reptilian ancestors of mammals.83% of all genera died out approximately 250 million years ago, in the Permian-Triassic mass extinction event.