Turtles today are often slow-moving, modestly sized creatures, but their ancient relatives were quite different. Long before ...

King Cobra was considered the largest venomous snake to have ever roamed the face of the Earth. Due to its enormous length, ...

Previous research indicated that kangaroos weighing more than about 350 pounds would rupture their ankle tendons if they tried to hop. The largest of the Ice Age kangaroos, Procoptodon goliah, which ...

The dire wolf may be extinct, but some modern wolf species still reach astonishing sizes. This video takes a closer look at ...

Inside the stomach of an ancient wolf puppy found entombed in Siberian permafrost, scientists discovered meat from a woolly ...

The sadly now extinct rhino lived on the steppes and tundra of Europe and Asia, living alongside people for thousands of ...

When scientists finally measured the most powerful bite ever recorded, the winner wasn’t T. rex. It was something far older, yet far more familiar.

Apart from fossils, some animal species also testify to how big their predecessors were before evolution. Although many of Earth's biggest creatures are now extinct or have evolved, blue whales are ...

This year, at least six animal and insect species moved to the Extinct category of the IUCN Red List of Threatened Species Kelli Bender is the Pets Editor at PEOPLE. She has been working at PEOPLE ...

The Campbell’s keeled glass-snail is officially extinct, but researchers have ‘high hopes’ that translocation will allow the population to thrive ...

Back in 1999, the BBC’s Walking with Dinosaurs series spawned a new format: wildlife “documentaries” featuring long-extinct animals. I’m a big fan of this genre, and Prehistoric Planet: Ice Age, made ...