In terms of the number of humans killed every year, mosquitos by far hold the record, being responsible for between 725,000 and 1,000,000 deaths annually.
Mosquitos are by far the deadliest creature in the world when it comes to annual human deaths, causing around one million deaths per year, compared to 100,000 deaths from snakes and 250 from lions. Perhaps surpringly, dogs are the third deadliest animal to humans.
Ungainly as it is, the hippopotamus is the world's deadliest large land mammal, killing an estimated 500 people per year in Africa. Hippos are aggressive creatures, and they have very sharp teeth. And you would not want to get stuck under one; at up to 2,750kg they can crush a human to death.
Horses and cows kill the most humans every year in Australia
It really is no joke.
Cassowaries have a reputation for being dangerous to people and domestic animals. The 2007 edition of the Guinness World Records lists the cassowary as the world's most dangerous bird.
What would it take to kill them all? A lot.
In terms of the number of humans killed every year, mosquitos by far hold the record, being responsible for between 725,000 and 1,000,000 deaths annually. That is not to say these tiny insects set out to kill, however.
There are 13 species of crocodiles (from the order Crocodilia), all of which can be found in the tropical regions of Africa, Asia, Australia, and North and South America. Around 1,000 people are killed each year at the jaws of opportunistic crocodiles.
5. Freshwater snails: 20,000+ deaths a year. The freshwater snail carries parasitic worms that infect people with a disease called schistosomiasis that can cause intense abdominal pain and blood in the stool or urine, depending on the area that's affected.
4. Dogs: 25,000 people per year. Man's best friend can also be a nightmare. Maulings and bites from rabid dogs are both to blame for the 25,000 dog-related deaths each year.
To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle.
The absolute unbeatable beast who took home the title for best fighter: the elephant. With a 74% win rate, it just eked out a win over the rhinoceros, who also received a 74% win rate. (Just a few extra tenths of a percent gave the elephant the top spot.)
Yes, animals do practice revenge. Chimps do it, for example. Macaques do it, too, although not directly: if they cannot attack the offender because he is much stronger, they would hurt someone weaker instead, sometimes the attacker's relative.
It's Natural to assume that animals with large teeth and aggressive reputation animals like lions or poisonous snakes are the world's deadliest killers. But appearance not sufficient to judge the creature's deadliness. Mosquito has recorded the maximum killing of people every year.
Animals with no natural predators are called apex predators, because they sit at the top (or apex) of the food chain. The list is indefinite, but it includes lions, grizzly bears, crocodiles, giant constrictor snakes, wolves, sharks, electric eels, giant jellyfish, killer whales, polar bears, and arguably, humans.
Humans are top predators of many wildlife species, and our mere presence can create a "landscape of fear," according to researchers at the University of California, Santa Cruz. Fear of humans suppresses the movement and activity of pumas, bobcats, skunks, and opossums, which benefits small mammals.
The Dingo is Australia's largest terrestrial carnivore, though it occasionally eats plants and fruits. They're opportunistic hunters, but will also scavenge food. The bulk of their diet is made up of meat: they eat kangaroos, wallabies, feral pigs, wombats, small mammals (rabbits, rodents), birds and lizards.
Australia's apex predator, the dingo (Canis dingo) influences the abundance and behaviour of herbivorous prey and mesopredators in arid ecosystems. The dingoes' ecological role is uncertain in more productive forested environments of eastern Australia.