River Monsters (2009)

Jeremy Wade sets out to discover the true river monster of South America. Piranhas get all the press, but is there a more fearsome predator lurking in its rivers? Tipped off by an account of an attack on a diver, Jeremy soon discovers that there is a real monster to find. Tipped off by the the local Amerindian tribe, Jeremy heads deeper and deeper into the remote jungles of Suriname to come face to face with a jungle killer like no other.