Flat as the river bottom, huge freshwater rays are further camouflaged by their patterns.
Tiny poison dart frogs don't have to hide. Their bright colors advertise that they're toxic.
Growing up to 10 feet long, the arapaima is one of the world's largest freshwater fishes.
Seasons of the river
From cacao to caimans, the Amazon is renowned for its dizzying array of plant and animal species. Annual flooding transforms the forest into a place where fishes swim among trees and find new opportunities for food and shelter. The species that have evolved in this rich setting are interlinked in complex connections of predator and prey, plant and pollinator, producer and user. The whole ecosystem depends on the continued survival of each of its parts to remain healthy.