Mosquitoes: In addition to being bothersome insects, mosquitoes can transmit serious illnesses like dengue, zika, and malaria, which kill millions of people every year.
Box Jellyfish: The highly lethal venom of box jellyfish can result in a swift and severe collapse of the cardiovascular system in humans.
Cape Buffalos: More African hunters have died at the hands of cape buffalos than any other large animal due to their aggressive nature.
Saltwater Crocodiles: these fiercely protective animals have attacked people multiple times, frequently killing them.
African elephants: are generally calm creatures, but when they feel threatened, they can turn deadly. More African deaths result from elephant attacks than from any other large mammal.
Poison Dart Frogs: Although they are small in stature, poison dart frogs are deadly or paralysing due to their strong toxins.
Polar bears: can be very dangerous because of their size and strength, and they have been known to attack people on rare occasions.
Africanized Honey Bees: commonly referred to as killer bees, are infamous for their massive, persistent attacks and extreme aggression.
Tsetse Fly: Spreads the potentially deadly disease sleeping sickness, which affects both humans and animals.