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A black caiman is basically an alligator on steroids. They can grow up to six meters (20 feet) long, with bigger, heavier skulls than Nile crocodiles, and are the apex predator in the Amazonian waters. That means they are basically the kings of the river—they eat nearly anything they can get their teeth into, including piranhas, monkeys, perch, deer, and anaconda.Oh, and yes, they totally attack humans. In 2010, a biologist named Deise Nishimura was attacked by a caiman while cleaning a fish on her houseboat, and while she managed to fight it off, it took one of her legs with it.