Sea creatures off the coast of California made for a moment where boaters thought they were in a “simulation.” ...

At about 2 inches long, Shibabdella wulingensis is considered a “medium-sized” leech, according to researchers. Its body is “ flat and cylindrical,” and “creamy or pinkish–white” in color, the study ...

Ice Age sea levels exposed vast plains supporting rich ecosystems and hunters.Knysna Cave reveals continuous human use, tool ...

Analysis - The Earth of the last Ice Age (about 26,000 to 19,000 years ago) was very different from today's world.

Over a million species of animals and plants are now hanging by a thread, more than ever before in human history, says the ...

Imagine traveling more than 600 miles from the only home you’ve ever known, to a mountain ridge you’ve never been to. It’s ...

A new study finds an Australian moth follows the stars during its yearly migration, using the night sky as a guiding compass.

Two 325-million-year-old ctenacanth shark fossils discovered in Mammoth Cave shed light on ancient marine ecosystems.

Five years. 180 expeditions. One supercontinent. NBC’s The Americas takes viewers on an epic journey from pole to pole, ...

Sticking out of the wood and flowing in the water were two “unusual,” feather-like creatures attached to the rotting material ...

The animals that plummeted 85 feet into Wyoming’s Natural Trap Cave provide a layered history of life dating back to the ...