The Fer-de-Lance is responsible for nearly all cases of snake bite in the upper Amazon Basin of Peru (Bothrops atrox). This is a juvenile (note yellow tail tip) coiled in the leaf litter. The snakes do well around humans, feeding on things like rodents. Rural families commonly have bathroom facilities away from their homes. Walking to said facilities in the dark delivers the perfect set of circumstances for snake bite...and the bites are defensive bites. This species grows to lengths of 50 inches. Photographed in Amazonian Peru, 2013.