Fifty thousand years ago, North America was home to towering giants. Mammoths roamed the tundra, saber-toothed cats hunted in ...

The massive fossil is suspected to belong to one of the most complete skeletons in the area, portions of which were ...

A strange cast of ferocious predators and giant herbivores ... evolved in South America and ventured north, while today’s grey wolves migrated from Asia, so the two species are not closely ...

There are about 50 species of flying squirrels ranging across most of North America down into Central America, and stretching from Southeast and Northern Asia into Siberia and Scandinavia.

The largest of all North American frogs, this giant can grow to a length of 8 inches or more and weigh up to 1.5 pounds. Even the tadpoles of this species can reach 6.75 inches in length.

The giant garter snake is one of North America's largest native snakes ... and industrial development has eliminated more than 90 percent of suitable habitat for the species, forcing snakes to rely ...