some of these areas while this shark migration is happening? it s just sensible really. the fact is that shark attacks are very, very rare, extremely rare, maybe one in the united states every year that occurs, that results in a fa a fatality. it s extremely rare. but it s very sensible to take precautions and not be in the water when there are lots and lots of sharks around like this. jenna: we are taking a look at some of the sharks in the migration. black tips and spinners. what can you tell us about those and why they are my great nothing this way? they are relatively small sharks compared to a great white. great whites can get up to 20, 21 feet long. these sharks maximum length on these guys is probably ten feet, but normally they are only about five or six feet long. these are small sharks. the reason that they are migrating right now is because they are following the food. haiher rings, sardines, mackerel is moving up the close between in a and the bahamas and