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 ...

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 ...

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 ...

Trump administration-led funding cuts and expansion of oil and gas drilling will impact conservation. Boulder Weekly ...