bob ] squak. >>> you think your day's tough, man-eating crocodiles, enraged hippos. deadly sharks. it's all in a day's work for dr. brady barro capture all 23 species. he's here to tell us what he's learned. why in the world you would risk your life and get up close and personal with these things, brady. thank you very much for being here. if we're choosing a career and many of us choose something like television that's fun, fine, i get that. but you put yourself in the middle of that. why so much danger? >> well, you know, i have a thrust for knowledge. and these animals are misunderstood or little understood. and so the chances of learning something about them is so great and spreading get word about them. these are important animals to the planet. if you talk about the cold and scalies, people want to leave the room. these animals need all the help they get. >> what i like about them, they're so smart. the things we don't know too much about, we're afraid of them. you help us. you say crocodiles are your comfort zone. you teach rangers in uganda how to capture those man-eating crocodiles. if you're teaching them how to do