From the parched deserts of Southwestern USA to lush forests of the Costa Rican mountains, delve into the deep, dark ecosystems in this part of the world. The creatures here have adapted to survive in an extraordinary variety of habitats, and that means they wield a diverse array of weapons. From the Bark Scorpion's heart-stopping sting to the Anaconda's giant coils, and the Gila Monster, one of only two venomous lizards in the world, to the shark-hunting Humboldt Squid, count down the region's twelve deadliest animals