The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ...

Long, sharp teeth are excellent at gripping small or medium-sized fish and squid. The bull shark has needle-like teeth that are slightly serrated, for example. They mostly eat fish, but will also ...

sharks and rays never run out of teeth, as they are endlessly replaced. Both sharks and rays have gills. Most have five but a few species of shark have six or even seven. On a shark the gills are ...

But they were still affected. Fossil teeth show that the asteroid strike at the end of the Cretaceous killed off many of the largest species of shark. Only the smallest and deep-water species that fed ...

Various kinds of shark teeth can be found in these places, including those from megalodons, mackerel sharks (including great whites and large mackerel), ground sharks (including sand tigers ...

Great whites get all the glory, but bottom-dwelling sharks bring plenty to the table. Here, we're looking at some of our favorite seabed shark species.

A new species of shark that was one of the ocean’s top predators following the extinction of the dinosaurs 65 million years ago has been discovered in the United States. The fossilized teeth ...