Most dangerous mammal?

What would you say is the most dangerous mammal? Which one killed the most humans? If you don't know any better you probably will say lion or tiger.

But actually they don't kill that many humans compared to nasty beasts like Hippopotamuses:

Despite the popular image of the animal being easygoing and peaceful, the hippopotamus is actually one of the most dangerous animals in Africa, and is said to account for more human deaths than any other African mammal. This is not because they are more aggressive than other African mammals but rather because they are highly territorial and their space often conflicts with that of farmers and tourists. In other words, the hippos are protecting their own territory and do not hunt humans.

Also on Staff Report is a nice description of the Hippos' behavior:

The hippo, found today throughout sub-Saharan Africa, is considered by many experts, explorers and Africans to be the most dangerous animal in Africa (not counting the mosquito). Crocodiles and cape buffaloes are badasses, too, but nobody seems to have kept an actual body count for any of these species and they don't have belts to notch. They've all killed way more people than Africa's lions have. (A few rogue tigers have killed a lot of people too, but they live in India, not Africa.) The hippo is extremely aggressive, unpredictable and unafraid of humans, upsetting boats sometimes without provocation and chomping the occupants with its huge canine teeth and sharp incisors.

And another really bad man killer kills over 20,000 people every year only in the U.S. But this is not done by a fierce monster, but by cute, little Bambi. Read more about the dangerous deers on CNN.com