#3 – Brazilian Wandering Spider
The Brazilian Wandering Spider is also referred as the ‘Banana Spider’. It has set a world record of human deaths caused by its sting. It has also listed its name in ‘Guinness Book of World Records in 2007’ for the most venomous animal. Its venom contains high percentage of serotonin and neurotoxins as well, which is enough to kill a human with just one sting.