Researchers have discovered the oldest known example of a predator-prey “arms race,” based on their study of ancient fossils. This ancient predator-prey relationship took place 517 million years ago ...

The world's oldest octopus fossil is no longer an octopus. A new study by researchers says the 300-million-year-old creature ...

The species in question was a therapsid, a group of animals that was the forefather to modern-day mammals, including humans.

Modern Nautilus and Allonautilus species inhabit deeper waters than their extinct ancestors did over 500 million years ago.

In 2000, researchers thought they found the oldest fossil octopus, which lived over 300 million years ago. But it may just be ...

Skeleton season may be just around the corner, but the skeleton age dawned with the early Cambrian Period, about 538 million to 506 million years ago. Subscribe to our newsletter for the latest ...