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Their speed and aggression immediately put them on top of the underwater food chain.
Tiger sharks are especially aggressive, so this diver had better hope the one he’s facing has already eaten today! Grizzly bears: While camping can be a very rewarding outdoor activity, spending time outside in the thick of nature can make for some potentially scary encounters.
If you’re not careful, you may just end up running into one of these grizzly fellows. Hippopotamus: When you think of the most dangerous animal in the world, not much thought is ever given to the hippo.
But they are, in fact, extremely territorial and will do whatever it takes to ward off a threat. Japanese spider crab: If you like seafood, you’ve probably ordered crab legs before.
Hidden in the forests of Ecuador and Colombia, the furry little critter -- the olinguito is related to raccoons -- evaded science journals until researchers from the Smithsonian Institution identified it last week.
According to a New York Times report from 2006 on several studies of cuteness, "cute images stimulate the same pleasure centers of the brain aroused by sex, a good meal or psychoactive drugs like cocaine." The sea anemone's poison -- which doesn't affect the clown fish -- protects the clown fish from predators and the clown fish pays for the protection by eating the anemone's leftovers and keeping the house clean.
Still, you might not have thought about what the animal looked like before it was caught by fishermen.
There are plenty of intimidating animals that are obviously out to get you – from fang-toothed wild cats and gargantuan bears to lethal sharks and massive poisonous snakes.
In fact, herbivorous personalities like deer, bison and sheep are far more numerous in the human zoo.