Some were the size of a dog. Others were as large as polar bears. A newly-discovered fossil of the ferocious hyaenodont is helping scientists understand a little bit more about the mysterious ...

Million-Year-Old Fossil of a 'Super Ostrich' Almost the Size of a Polar Bear Amazes Researchers Extinct animals provide ...

Two-thirds of the world's polar bears could be extinct by 2050 if greenhouse gas-fueled global warming keeps melting their Arctic sea-ice habitat. The Center has led the charge to save polar bears ...

Polar bears are one of the largest surviving prehistoric animals. Their existence is deeply connected to the health of polar ecosystems.

The size of Crete, Wrangel is so cut off that the very last population of woolly mammoth survived there thousands of years after going extinct in ... concentration of polar bears on the planet.

5 and will continue through Feb. 9. The weekend will feature “staple” Winter Carnival events, such as the annual Polar Bear Plunge — which will be named the “Prehistoric Plunge,” according to the ...