6. Eastern diamondback rattlesnake (Crotalus adamanteus)
LD50: 1.2
Eastern diamondback rattlesnake inhabits southeastern parts of the US. Apart from being among most venomous rattlesnake species in the world, it is also the largest rattlesnake species, not so because of its length (between 30 and 75 inches), but its weight (5-10 pounds on average). It also has very long fangs, about 1 inch in length which adds to their fearsome looks. It injects a very big dose of venom when bites, around 410 mg per bite, which makes them highly dangerous.
