A very unique kind of ray is called the sawfish. They have an elongated snout that resembles a saw, which is called their rostrum. Their rostrum is elongated to contain many pores with organs called 'Ampullae of Lorenzini' that can detect electromagnetic fields. All sharks and rays have these, which helps them find prey, but certain species like the Sawfish have evolved a larger surface area containing these detection organs to aid in hunting. Another species of note that has this same trait: the Hammerhead Shark! That's why it's head is shaped this way. A very unique kind of ray is called the sawfish. They have an elongated snout that resembles a saw, which is called their rostrum. Their rostrum is elongated to contain many pores with organs called 'Ampullae of Lorenzini' that can detect electromagnetic fields. All sharks and rays have these, which helps them find prey, but certain species like the Sawfish have evolved a larger surface area containing these detection organs to aid in hunting. Another species of note that has this same trait: the Hammerhead Shark! That's why it's head is shaped this way.