reporter: contributing factor, perhaps a perfect storm of environmental and biological variables. some sharks feed on turtles and small fish close to shore. drought conditions could play a role, among other things. certainly warm water this year, higher sill lynntys, bait fishes in the water, turtle nesting season, all factors that would promote more sharks on the beach. reporter: one of the attacks happened near a pier in north carolina. too close for comfort for fourth of july weekend surfers and holidayers. the other day i saw about a five-foot sand shark and it was within eight feet of me. but stayed out in the water. it s its natural habitat. we re in its home. have to be aware and of your surroundings and be careful. reporter: the likelihood of