20. Neotropical rattlesnake (Crotalus durissus)
LD50: 0.17
This species is partially distributed throughout the South American continent, inhabiting a wide range of habitats, preferring drier stony deserts, and semi-arid areas rather than forested lands. It grows up to 1 meter in length. Depending on the surroundings, coloration and patterning vary, but it is usually brownish in color with a diamond shaped pattern that merges with two lines that extend from the base of the head. Its bite can be medically treated, but since most victims are far away from a hospital, they result in several deaths in South America annually.
