>> i know you're wondering, will i survive.n is edition of "sharks and reptiles." good evening. regular viewers of this show will know i'm not afraid to talk to anybody or take on anything. bring it on. i can handle it. well, tonight, i'm not feeling quite so confident. we have rather unusual guests, guests that scar the living daylights out of most people, sharks, pythons, alligators, the stuff of nightmares but should they fear us more than we fear them? joining me is a wildlife biologist and host of abc's ocean mysteries. jeff, welcome to you. >> thanks so much, piers. delighted. >> my experience with a shark, i was doing a small dive in barbados in the caribbean and a hammer head shark about 10 feet long just patrolled past us, and it was utterly terrifying.