The first warm-blooded animals appeared abruptly 233 million years ago, according to clues hidden deep inside their ears. Before now, scientists estimated that warm-bloodedness, or endothermy, ...

Not all sharks are cold-blooded killers—some are warm-blooded killers, and recent research helps elucidate why. A new study published June 30 in the scientific journal Functional Ecology considered ...

The coiled channels deep within the ears of fossilized and modern animals reveals that mammals became warm-blooded 233 million years ago. By Kate Baggaley Published Jul 20, 2022 11:09 AM EDT Get the ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Were dinosaurs warm ...

Dinosaurs sit at the crossroads between reptiles and birds, leading scientists to debate whether they were warm- or cold-blooded. A new study may have found the answer for different groups of ...

People once assumed that dinosaurs were cold-blooded reptiles. That understanding has morphed over the last 50 years or so, and we now think many dinosaurs were warm-blooded and birdlike. New research ...

New research from marine biologists offers answers to a fundamental puzzle that had until now remained unsolved: why are some fish warm-blooded when most are not? It turns out that while (warm-blooded ...

Dinosaur blood ran hot and cold, scientists recently discovered. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Birds keep themselves warm with ...

Even though diversity typically decreases from the tropics to the poles, in the frigid waters of the high latitudes, warm-blooded marine mammals and birds thrive, both in number and species richness.