Temperament is what plays an important role in defining aggression in animals
They rise up slightly when they are worried or aggrevated and open their mouths. It’s so dangerous that only two drop of venom can kill you - causing cardiac arrest or respiratory failure
Their huge bodies, huge heads and powerful horns are tough and deadly. They're easily annoyed and can run at a speed of 35 mph
They frequently bang their heads and attack prey with their tusks. Although they rarely attack humans, their aggression can be extremely dangerous
Hippos are extremely powerful creatures and have been known to attack boats and even killing people. This third largest warm-blooded animal on the planet has excellent sight, smell and hearing
Sun Bear found in the rainforests of Southeast Asia are the smallest of the bear family. Its huge forepaws bear long, bended hooks, which it utilises for tearing into bug settlements to feed on
There have been many reports of saltwater crocodiles chasing boats and eating people. They can live for as long as 65 years
The Cassowary is one of the largest living birds. It even holds the Guinness World Record for the most dangerous bird in the world
They are known as one of the largest creatures found in the deer family. Both male and females have antlers , but they can still be differentiated as males' antlers are much more significant. They measure 6 feet at the withers and weigh 990 pounds