Being a human being protects you from predators. The only predators you have to worry about are caymans, which live in the water, and jaguars, which stay the hell away from people. The only predators I had to worry about were other humans. Edit: oh and snakes! But they're not preying on you, per say. You just have to watch your step. And spiders. And scorpions. And disease carrying insects. Disease carrying insects are your number one enemy. Followed by microbes. There was a dude with us who drank untreated water and I watched him get sick and die within 6 hours. They had to take him up river to another village with a radio to call for help. He had to be airlifted out, but he was already dead by the time the chopper arrived.