Male ghost sharks use tooth-studded rods on their foreheads for mating. Fossil and genetic evidence prove they are true teeth, showcasing evolutionary flexibility. Male “ghost sharks,” eerie deep-sea ...

Spotted ratfish, or “ghost sharks,” have forehead teeth that help them grasp onto mates. It’s the first time teeth have been found outside of a mouth.

Scientists have uncovered a new fossil species of extinct shark hidden within the winding chambers of Mammoth Cave in ...

Life on Earth started out microscopically small, but it didn’t stay that way for long. Here are five of the biggest creatures ...