This is the second-largest shark species in the world (second only to the whale shark), reaching lengths of 30-40 feet!  Amazingly, these sharks feed only on plankton and don't even have real teeth!  They feed using gill rakers, which collect plankton as the shark filters water into its mouth and out its gills.  These sharks were once hunted in great numbers because of the enormous amount of oil contained in their liver.  Today, they are a frequent sighting in the Gulf of Maine.