When water passes through its gills, the spines of the gill ... sea urchins. Some horn sharks even have purple-stained teeth from eating too many sea urchins! Horn sharks are slow swimmers ...

As sharks go, LeeBeth is something like a long-haul trucker with gills and giant teeth. Swimmers at the beach might not be excited to see the 14-foot white shark, but scientists following LeeBeth ...

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 ...

The basking shark’s scientific name ... special organs that prevent their food from escaping through the gills. Scientists believe their teeth—which are not used in feeding—are instead ...

Small organisms such as plankton get stuck in their gill rakers and the shark then consumes the food. Filter-feeding sharks include whale sharks, megamouth sharks and basking sharks. These species ...

That is why shark teeth are the most abundant vertebrate fossil ... and great whites must swim to pass water over their gills.) So the answer is no, emphatically. There are even some sharks ...

We mostly discover these extinct sharks through their teeth, which they grew in large ... it had a fish-like head with 7 gills instead of the usual 5 and it’s body was longer and less muscular ...

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.