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 ...

A team led by an Ohio State University professor analyzed over 4,000 mammal species to identify which animals are likely to have a hidden species. Some yet-to-be-discovered species are likely small ...

Human breast milk has long reigned as the most complex known mammal milk. But another species might dethrone us: gray seals.

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 ...

The Sept. 26 letter “Ruining earth will ruin humans” separates human beings from “mammals” for the wrong reason. Humans differ from other mammals because the latter live out their lives on the basis ...

Examining body sizes of ancient and modern aquatic mammals and their terrestrial counterparts reveals that life in water restricts mammals to a narrow range of body sizes -- big enough to stay warm, ...

Cancer is a sad fact of life, as nearly 40 percent of people are diagnosed with it at some point in their lives. But humans aren’t alone in this. Many different species can also develop the ...