Artist’s rendering of an early mammal called a mammaliamorph
Warm-Bloodedness in Mammals May Have Arisen in Late Triassic
Researchers mapped ear canal shape to body temperature to predict when ancestors of mammals first became endothermic.
Warm-Bloodedness in Mammals May Have Arisen in Late Triassic
Warm-Bloodedness in Mammals May Have Arisen in Late Triassic

Researchers mapped ear canal shape to body temperature to predict when ancestors of mammals first became endothermic.

Researchers mapped ear canal shape to body temperature to predict when ancestors of mammals first became endothermic.

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Close-up of the head of the Aldabra Giant Tortoise. Her face is dirty from eating grass on a sandy beach.
How Slow Can You Go?
Hannah Thomasy | Jun 23, 2022
Two studies show negligible rates of aging in some types of turtles and other cold-blooded creatures, but that doesn’t mean they’re immortal.
Illustration of a Tyrannosaurus rex on a rock on a mountain
Most Dinosaurs Were Warm-Blooded After All
Catherine Offord | May 26, 2022
Endothermy was widespread among both avian and non-avian dinosaurs, a study suggests, so the metabolic strategy is unlikely to account for birds’ survival through the mass extinction event that wiped out their dinosaur cousins.
Image of the Day: Shrinking Dinosaurs
Emily Makowski | Jan 3, 2020
As dinosaurs got smaller, their metabolism increased, paving the way for bird evolution.
Lizard Secretes Heat
Bob Grant | Jan 25, 2016
Researchers confirm the unprecedented endothermic abilities of a South American reptile.
Dinos Not Necessarily Cold-Blooded
Hayley Dunning | Jun 27, 2012
The leading argument for dinosaurs being cold-blooded is overturned as a nearly identical bone structure is found in mammals.