Anglerfish have invisible fangs, narwhal tusks are extra-long canines, and more facts from the weird and wonderful study of ...

triangular teeth. ‘Sharks have been around for 420 million years,’ explains Emma Bernard, our Fossil Fish Curator. ‘In that time, there have been as many as 5,000 different species. One of the reasons ...

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 ...

That is why shark teeth are the most abundant vertebrate fossil ... NOVA: Do sharks have to keep swimming to breathe? Gruber: Several species do, including hammerheads and mackerel sharks.

Along the western shore of the Chesapeake Bay where more than 30 miles of cliffs – some as high as 100 feet – generations of people have been finding fossils, especially shark teeth that date ...