A newly discovered prehistoric mammal may hold clues to how life survived the dinosaur-killing extinction. The tiny species, ...

Here are the wildest extinct prehistoric creatures that aren't dinosaurs. It's hard to imagine how some of these animals even worked at all.

Mammals and dinosaurs coexisted on Earth until a catastrophic event 66 million years ago killed 75% of life on the planet.

It used to be thought that only one species of man-o-war jellyfish lived in Japanese waters, but a stranded specimen ended up being an entirely new species. Physalia mikazuki, whose name translates to ...

This extraordinary animal supports a secret subterranean ecosystem.