 National Geographic says there's nearly 4,000 species of snakes in the world. A Gallup poll shows 51% of us say we're afraid, but we shouldn't be. Outdoor Life says poisonous snakes kill about five people every year. So do bears. And vending machines kill two a year. And snakes keep their rodent population in check. No snakes and rodents would take over. And that could be worse. I'm Bree Tennis.