In nature, most animals, including humans, birds, and reptiles, have two eyes. That’s usually enough to help them see, move around, find food, and stay safe. But some animals don’t follow this rule.

A rarely seen deep-sea creature has just been captured on film—and what the camera revealed left researchers speechless. Drifting slowly through the pitch-black waters of the abyss, the strange, ghost ...

Trilobites, a group of extinct marine arthropods, had a hidden third eye — and sometimes even a fourth or fifth, new research suggests. Paleontologists knew that, like other arthropods such as insects ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. We know more about the vast expanses of our solar ...