With our planet around for nearly five billion years, countless species have walked—or crawled—on its surface. Some of them have managed to fight for their existence and staved off extinction.

Scientists still debate the purpose of this dinosaur's iconic horns and spiky head plate. Find out what we’ve learned about how Triceratops lived and why it went extinct. Triceratops’ enormous ...

Prehistoric times had no shortage of pretty scary creatures, but you need to look no further than this huge arthopod to find something truly terrifying.

here are the animals that get my vote for “most prehistoric-looking.” They may not be the oldest animals on Earth, but they aren’t recent creations either. Most of all, when you look at them ...

The animals constantly grew new shell material as they aged, but the their bodies always remained in the outer chamber. The walls that separated each chamber helped protect the shell from being ...