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

The prehistoric crocodile relative may have tolerated both freshwater and saltwater habitats, allowing it to conquer North ...

More than 22% of native pollinators in North America are at an elevated risk of extinction, the research found. Researchers blame habitat loss, pesticide use and climate change for the problem.