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In a position where you could potentially be mistaken for one of their prey items. we are trying to sort out what drives the mechanics of these animals, what motivates them to do what they do. we're on the water as much as we can collecting data on these fish. >> take a look at this video from thursday in provincetown, massachusetts. a great white is feasting on a seal there off the shore on the race point beach in that area. more sharks also spotted off the coast, all on the cape on friday. jon? jon: it is pretty rare to get bitten by a shark, is it not? >> yeah, it is, very rare. that's the ...

Offshore. >> be vigilant. these are areas where the sharks are hunting for seals. he did not want to place yourself in a position where you can potentially be taken for one of their prey items. we try to sort out what drives the mechanics of the animals paid what motivates them to do what they do. we are on the water as much as we can collecting data on the fish. reporter: look at this video. this is from thursday in provincetown, massachusetts. it is a great white feasting on a seal, right off the shore of race point beach. more sharks were also spotted off the coast of -- all on the cape fri...

Them to shore. swimming near a group of seals about 30 yards off shore. >> the vigilant. these are areas where these sharks are hunting for seals. you don't want to place yourself in a position where you could potentially be mistaken for one of their prey items. we are trying to find out what drives the mechanics of these animals and motivate them to do what they do. we are on the water is much as we can be collecting data on this fish. reporter: this is video from thursday in provincetown massachusetts facing on a feel -- on a scale. all on the tape friday. experts point out while attack are ...

Of food in the water. that said, seven in three weeks is not totally explain bid that so there's an x factor out there we don't know about right now that is also contributing. >> george we're showing pictures of great whites. thanks "jaws" and other literature, those are the sharks that everyone seems to fear the most. what are the most threatening sharks to humans and where are they generally found? >> there are three species we're most concerned about. you already mentioned white sharks, of course. bulls and tigers are the other two that we're most concerned about. all of them get to a large...

Year, especially this time of year. so it seems like the shark activity is a lot more, and swimmers and bad visibility and all those things are sometimes confused as prey items. martha: so you're saying the waters are warmer than usual, and the fish that they're feeding on, are they closer in than they usually are? >> well, sometimes these fish are just stimulated sometimes it's just by people walking around in bad visibility. you wouldn't think so, but aye definitely seen it where people have just walked around on the beach and been three, four feet off the shore and there have been bay fish ...