Ecological relationships in the Amazon Rainforest are very complex. There are many different relationships in the rainforest that go from predators and their prey, to symbiotic relationships in their own communities. An example of a predator-prey relationship would be the Anaconda and the Capybara. The Anacondas feed of the Capybaras and that keeps both species populated correctly. A symbiotic relationship in the rainforest would be a strangler fig plant. These little seeds start to squeeze out of the cranny's of various types of canopy trees and start sending small vines and roots down the trees. These small plants now start to compete with the host tree for it's nutrients and sunlight. As the strangler roots grow down the tree, they get larger over time eventually squeezing the host tree to death so it doesn't have to compete for it's nutrients and sunlight anymore.
This photo is a chart of some of the organisms in the Amazon rainforest. It shows which animal eats what, and who gets the energy in the end.