Long before humans walked the Earth, the skies of South America were ruled by a colossal bird. Argentavis magnificens, one of ...

Do the bones of all Nile crocodiles have the same number of growth marks as their age? And can such growth rings be counted to accurately gauge the age of these reptiles? Is this also an accurate ...

Do the bones of all Nile crocodiles have the same number of growth marks as their age? And can such growth rings be counted to accurately gauge the age of these reptiles? Is this also an accurate ...

The curious minds at What If investigate what Earth was like during the Cenozoic era, revealing mammalian evolution, climate change, and continental shifts. House Republicans break with Trump, ...

Baby dinosaurs weren’t coddled like lion cubs or elephant calves—they were more like prehistoric latchkey kids. New research ...

A plantation worker photographed this new genus of mammal in New Guinea, thought to have been dead for 6,000 years.

Mammals are not especially diverse. Roughly 6,800 mammal species are known to exist, compared with about 8,800 species of amphibian, 11,000 species of bird and 12,500 of reptile. Yet when most people ...

Tiny fossil teeth from Colorado are revealing new clues about the very first relatives of primates, including humans.

Explore mammals’ surprising origins, long before the age of dinosaurs. The surprising story of mammal evolution begins long before the age of dinosaurs. Witness how some of our prehistoric mammal ...

Just in time for summer, the megalodon—the ancient, city bus-sized shark known as the “Megatooth”—has reared its ravenous snout. While the oceans are now safe from the Megatooth, which went extinct an ...

purely terrestrial hypothesis links each first-order immigration episode to wholesale reorganization of the continental ecosystem triggered by climatic shifts. Two major contradictions to the first ...