Terrifying Creatures Of The Amazon River, The Amazon River "7 Terrifying Creatures Of The Amazon River"10 Terrifying Creatures Of The Amazon River"5 TERRIFYING PREDATORS of the Amazon River Basin!"VAMPIRE FISH - Amazon River Monsters"Giant Testicle Biting Piranha - River Monster"World's Deadliest Animals - Amazon"World's Deadliest Animals - Amazon"BIGGEST PIRANHA - Amazon River Monsters" Continuing with the theme of gigantic reptiles"Arapaima, also known as “pirarucu” or “paiche"CRAZY CATFISH! - Amazon River Monsters"River Monsters: Alone in Victory*World Top Ten Terrifying Killer Fish"Monster Arapaima is Your 'Mermaid' of Lore | River Monsters"WOLF FISH - Amazon River Monsters 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.