Goliath Tigerfish.

A native of the Congo River basin, the Lualaba River, Lake Upemba and Lake Tanganyika in Africa, it's the largest member of the tigerfish clan, a genus of fierce predators with protruding, daggerlike teeth.

Locals say it's the only fish that doesn't fear the crocodile and that it actually eats smaller ones. It's also been known to attack humans in rare instances.