look what the shark did to the bottom of his kayak in santa cruz, california. 15-foot long great white built into the hull. you can see the teeth marks. the shark even left behind tooth fragments. the kayaker wasn't hurt. his friends pulled him to safety. both peach beaches are open today, but swimmers are told to watch out for seals, not sharks. they need to stay away from sharks. experts say the sharks are hunting seals, not people. even so, it makes vacationers nervous. >> the thought of a shark coming near me up in the water is a pretty freaky. >> makes you think twice about jumping up the water. >> i'm joined tonight by chris, a marine biologist and shark expert. what do you make of all this. how does the story strike you? >> i have the same conversation