5. Western rattlesnake, prairie rattlesnake, Great Plains rattlesnake (Crotalus viridis)
LD50: 1.01
This rattlesnake ranks 5th in our list of most venomous rattlesnake species in the world. It has a huge range of distribution, it reaches up from southern parts of Canada to Mexico, and it is considered to be most widely spread rattlesnake in the US, where it inhabits areas around the Great Plains to the Rocky Mountains. They reach around 4 feet in length on average. They vary in color, being gray, olive green, covered in speckles which melt into stripes in the lower part of the body. They are rare species of rattlesnakes that produce the Mojave toxin (see further on the list), which makes them very dangerous, though encounters with humans are rare.
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