Deep beneath Kentucky’s rolling hills, in the dark reaches of Mammoth Cave National Park, paleontologists have unearthed the fossilized remains of two never-before-seen prehistoric shark species.

Sharks have been swimming Earth’s oceans for more than 400 million years, evolving into an incredibly diverse group of ...

If current extinction trends continue, global shark populations will lose much of their variety, thereby threatening ecosystems where specialized species serve vital roles, researchers have found. In ...