Dinosaurs so thoroughly dominated the ancient world that they suppressed the evolutionary possibilities open for mammals. This notion has been around for decades now, and it seems to be backed up by ...

Endothermy, or warm-bloodedness, is the ability of mammals and birds to produce their own body heat and control their body temperature. This major difference with the cold-blooded reptiles underpins ...

A new study suggests that endothermy appeared in mammalian ancestors about 233 million years ago, well before the origin of mammals, which occurred about 200 million years ago. Endothermy, or ...

If biologists have learned anything over the past decade, it is how similar all mammals are at the genetic level. 95% of the genes found in mice are also found in humans, and we even share a ...

The common ancestor of modern mammals was tiny and shrewlike, living unobtrusively in the shadow of the dinosaurs – or so we thought. A genetic analysis now suggests it may have been more like a small ...

Huge die-offs of elephant seals occurred after the virus gained nearly 20 troublesome new mutations, scientists found. By Apoorva Mandavilli Elephant seals in South America died in massive numbers ...

If biologists have learned anything over the past decade, it is how similar all mammals are at the genetic level. 95% of the genes found in mice are also found in humans, and we even share a ...

For researchers who rely on lab animals shipped from distant sources, and for the companies that breed them, the options are narrowing again. This week, People for the Ethical Treatment of Animals ...

National Geographic estimates there are between 50 billion and 430 billion birds populating the planet, outnumbering humans by up to approximately 50 times. Spread across 9,700 species, according to ...