Modern mammals are known for their big brains. But new analyses of mammal skulls from creatures that lived shortly after the dinosaur mass extinction show that those brains weren’t always a foregone ...

The debate has raged for decades: Was it humans or climate change that led to the extinction of many species of large mammals, birds, and reptiles that have disappeared from Earth over the past 50,000 ...

Over the past 125,000 years, the average size of mammals on the Earth has shrunk. And humans are to blame. That's the conclusion of a new study of the fossil record by paleo-biologist Felisa Smith of ...

For some mammals, the evolutionary path to gigantism after the dinosaurs’ demise wasn’t always a straight road. Species of extinct, hefty, rhinoceros-like creatures called brontotheres evolved into ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

During the Cretaceous period 125 million years ago, a ravenous Repenomamus, an ancient mammal the size of an opossum, pounced on an unsuspecting Psittacosaurus—an herbivorous dinosaur more than three ...

Last week Chicago’s Field Museum of Natural History placed on exhibition a unique skeleton: that of Titanoides faberi, earliest mammal of its size known to exist on Earth. Like birds, mammals are ...

Despite a common narrative that male mammals tend to dwarf female ones, fewer than half of mammalian species display that pattern, a new study suggests. By Emily Anthes Female elephant seals are not ...

(Corrects spelling of Nuttall throughout) * African game reserves failing to protect animals * Parks' big mammals 59 percent down since 1970 ABIDJAN, July 13 (Reuters) - Africa's game parks have lost ...

Human hunting, not climate change, played a decisive role in the extinction of large mammals over the last 50,000 years. This conclusion comes from researchers who reviewed over 300 scientific ...