Male "ghost sharks"—eerie deep-sea fish known as chimaeras that are related to sharks and rays—have a strange rod jutting from their foreheads, studded with sharp, retractable teeth. New research ...

Ghost sharks have evolved rows of true teeth on a bizarre forehead rod used for mating. Fossil and genetic evidence revealed the tenaculum’s teeth develop the same way as those inside the mouth, ...

Great white sharks have a reputation as ruthless ocean predators, but decades of research suggest their behavior is far more ...

Shark teeth are a marvel of evolution. They are so sharp that many island cultures once used them as weapons and tools to hunt and cut up meat. Unlike human teeth, shark teeth line the mouths of these ...

Learn more about ghost sharks’ bizarre forehead teeth that make them one of the most biologically unique animals on Earth. From colorful displays to aggressive fights, mating rituals vary widely ...

Add Yahoo as a preferred source to see more of our stories on Google. 'There is a corrosion effect on sharks' teeth,' a study's author said. | Credit: Illustration by Stephen Kelly / Getty Images ...

A peculiar dental condition known as shark teeth is gaining increased attention from parents and pediatric health care professionals across the United States as more families encounter the startling ...

Even sharks’ famous tooth-regrowing ability may not save them from ocean acidification. Researchers found that future acidic waters cause shark teeth to corrode, crack, and weaken, threatening their ...

CT (computed tomography) scan of the adult male Spotted Ratfish frontal clasper (Tenaculum) covered in rows of teeth (rainbow colors). Male “ghost sharks” — eerie deep-sea fish known as chimaeras that ...

Male “ghost sharks” — eerie deep-sea fish known as chimaeras that are related to sharks and rays — have a strange rod jutting from their foreheads, studded with sharp, retractable teeth. New research ...