5. Black mamba (Dendropaspis polyepis)
LD50: 0.05
Black mamba ranks 5th in our list of the 20 most venomous snakes in the world. This highly venomous snake is indigenous to eastern and southern Africa. They grow around 2.5 meters on average, and have slender body structure, being lightly colored – light brown to gray. So, why black mamba then? The name comes from the color of the interior of their mouths, which they open widely when being challenged. Black mambas can be very aggressive. When threatened and ready to attack, they often raise their upper body high off the ground, hiss violently, and attack very fast. Sometimes mamba can bite several times during an attack, each time injecting a huge portion of highly toxic venom into its victim. Deaths caused by this snake are still very often, with fatal results occurring only 30-60 minutes after the bite, if not medically treated immediately.