Harry Marshall and his intrepid team record the cycles of the mightiest river in the world. The crew fights off the stifling heat and unimaginable numbers of insects to offer a look at the predators of Amazonia. The two-and-a-half-million square miles of rainforest, nourished by flood waters, is home to jaguars, tarantulas, and swarms of army ants, who find no dearth of prey, especially among the thriving rodent population.