Explorer - Ultimate Viper

Seizoen: 22 - Aflevering: 6 / 181 - Eerst uitgezonden: 21 november 2007 - Episode ID: 539863

Vipers have been evolving their way to the top of the reptile heap for millions of years. Their venom is lethal and they can strike with precision in complete darkness. Now, some vipers may be evolving into even deadlier forms. Did humans help?