Ever wonder why sharks have so many differently shaped teeth or why they keep regrowing throughout their lives? Dr. David ...

The bull shark has needle-like teeth that are slightly serrated ... By contrast, humans are responsible for killing about 100 million sharks a year.’ The average modern shark tooth is usually between ...

A rendering of Clavusodens mcginnisi, or “McGinnis’ nail tooth,” an ancient shark that stalked the ocean floor 340 million years ago. Rendering courtesy of the National Park Service A shark ...

While snorkeling, she was attacked in her "upper extremities" by a bull shark, Skippings continued. Teen Who Lost Leg In Shark Attack Faces Her Fears to Be a Better Advocate for Sharks After the ...

blacktip shark and ragged-tooth shark sightings increased; tiger shark sightings were stable, and bull shark and dusky shark sightings decreased. In some cases, these changes are likely to reflect ...

A shark begins feeding upon innocent swimmers ... With the help of his friend Nolan and his wife Dottie he starts the fight with the bull sharks.