The aftermath of a bite from this Old World viper is not pretty. Symptoms include bleeding from the gums and in urine, and pain for up to a month. The bite can also be lethal.
The venom of mature cobras contains both nerve and heart toxins. The mortality rate for untreated victims is estimated to be 20 to 30 percent.
The krait's bite may not cause any pain or even be noticed if a person is asleep. Its venom is full of powerful neurotoxins. A victim can suffocate to death four to eight hours after being bitten.
This snake can deliver a lot of venom at a time. The combination of neurotoxins and cardiotoxins can kill in as soon as seven hours.
The king cobra's venom may not be the most potent, but its effects are incredibly deadly. It can spit its toxin and only 7 milliliters of the venom can kill 20 humans or one elephant.
This viper's venom is so powerful that it is blamed for more human deaths than any other snake species in its region.
The venom of this spider is reputedly twice as deadly as cyanide. Effects on a human include increased blood pressure, arrhythmia, coma, and death. It can kill a small child within 15 minutes.
The boomslang can open its jaws as wide as 170 degrees when biting. Its venom contains a hemotoxin that disrupts blood coagulation. The venom is slow-acting, which helps buy time to obtain anti-venom.
This sea snake has the deadliest venom of all sea snakes. The venom can cause paralysis, blurry vision, difficulty swallowing or speaking, and, in about 3 percent of victims, death.