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

The mother pronghorn, which can quite easily outrun the lone wolf, tries to distract the savage killer from its pursuit of her baby. Pronghorn are the fastest North American land mammal, with a top ...

New research found that more than 22% of native pollinators in North America are at an elevated risk of extinction.

This mammal climbs trees by pulling itself up with its front ... mi) ranges that females (24-50 sq. mi). North American densities vary from one black bear per 0.9 - 76 sq. mi. Costello, C. 1992. Black ...

Published in Science Advances, the study found that many species do not stick to a single daily rhythm, contradicting decades of scientific assumptions. These findings reveal the flexibility of ...