>> you would be amazed at the number of people who scuba dive and try to grab a nurse shark and try to grab them out of a cave. there's been 50 attacks by nurse sharks primarily by people who are trying to pull them out of their cave and touch them. >> keep your distance from the sharks. >> watch them. enjoy your experience. don't touch. >> you've seen this footage of a shark that sort of washed up on the jersey shore, flipping on the sand. they always show in these news stories the great big white shark jumping out of the water, pulling a helicopter down. >> right. >> this one is the sweetest little shark. you want to name him, you know, fido and take him home. it's sweet. i wish they showed more of this every time they said in chattah, massachusetts, a great white sighting. no. it's a little minnow. it's a disney character. i think it's important to say that. i think we should sort of change our thinking about sharks in general. >> right. >> more than half the shark species are less than three feet long. over 400 species of sharks.