A group of marine biologists who have spent years researching sharks and their behaviour were completely dumbfounded by a ...

But they don't have special organs for sound production and apparently ... in a lifetime—their teeth would fall out. That is why shark teeth are the most abundant vertebrate fossil material ...

A parasitic fish called a lamprey sometimes attaches itself near a male shark’s claspers, or reproductive organs. This can make it more difficult for scientists to identify an individual’s sex.

The female 12-year-old shark weighed nearly 2,000 pounds and was 15 feet long. The first thing you'll notice is the stomach in the shark's mouth. Scientists aren't sure why this happened ...