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

Today, fossils feel almost self-explanatory. You see a tooth, a shell, or a skeleton in a museum case and instinctively treat it as evidence of ancient life, preserved over immense spans of time. That ...

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 ...

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