"Watch the full episode here: This island off the coast of Brazil is illegal to visit. Why? This is Snake Island. It's populated by 4, 000 golden lancehead viper snakes, and they're not so friendly to ...

If you're not a fan of snakes, look away now. Experts have captured slow–motion footage of a viper sinking its fans into prey – and it's not for the faint hearted. The video reveals how venomous ...