Feeling a little blue? Well the Motivational Megafauna want you to turn that frown upside-down and learn to love yourself. And if you happen to recall which one is a Procoptodon and which one is a Smilodon tomorrow, they will be simply delighted.

Scientists believe that thousands of years ago, megafauna like mastadons helped disperse the enormous seeds of many plants. They'd eat the seeds, and then deposit them in their wanderings. But, with those creatures millennia dead, how do these plants still survive? In one case, it due to thievery-loving rodents.

Forget your tired images of prehistoric humans riding atop woolly mammoths and replace them with the thought of people hopping about inside the pouch of a giant wallaby. New research suggests that early humans coexisted with Tasmania's megafauna — and might have had a hand in their extinction.

We usually think of woolly mammoths as purely Ice Age creatures. But while most did indeed die out 10,000 years ago, one tiny population endured on isolated Wrangel Island until 1650 BCE. So why did they finally go extinct?

Charles R. Knight was a wildlife illustrator whose career spanned the era when dinosaurs first captured the public imagination in the late nineteenth and early twentieth century. Unlike other nature artists of his generation, Knight realized that the same skills he used to capture the beauty of wild animals could be…

About 13,000 years ago, the megafauna of North America began to die out, and the world entered a brief cold period known as the Younger Dryas.

So we've gone to all that trouble to clone ourselves a mammoth. Let's say we even give it a mate. What do we do with them? Perhaps the mammoths, and other creatures, shouldn't just be in zoos and captive breeding programs. Instead, maybe we could recreate a whole ecosystem from scratch.

We know that humans reached North America between 40000 and 16000 years ago...and that's about all we know for certain. Anything in American prehistory before about 10000 years ago remains deeply controversial. But some mastodon bones found in the 1970s recently revealed major clues.

Sixty million years ago, the world belonged to Titanoboa, a gigantic snake that measured 40 to 50 feet long and weighed over 2,500 pounds. Only one creature could challenge it: a newly discovered, twenty-foot freshwater crocodile.

The most recent ice age was dominated by gigantic mammals like the mammoth, woolly rhinoceros, and saber-tooth cat. But there's an evolutionary mystery here. How did these animals enter the ice age already perfectly adapted for such brutally cold climates?