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The Amazon Basin is the world's most diverse ecosystem. The numbers of cataloged plant and animal species are astronomical, and scientists are discovering new ones all the time. More than 25,000 classified species of plants are in the Peruvian Amazon (and 80,000 in the entire Amazon Basin), including the 2-meter-wide (6-foot-wide) Victoria Regia water lilies. Scientists have cataloged more
than 4,000 species of butterfly and more than 2,000 of fish—a more diverse aquatic life than that of the Atlantic Ocean. Scientists estimate that the world's tropical forests, while comprising only 6% of the Earth's landmass, may hold up to 75% of the planet's plant and animal species. This land is also the largest natural pharmacy in the world: one-fourth of all modern medicines have botanical origins in tropical forests.Most mammals are nocturnal and difficult to spot, and hunting has made them wary of humans. You're likely to see an array of birds, butterflies, and monkeys, and if you're lucky you'll spot bufeos (freshwater dolphins) or caimans along the Amazon tributaries.
A sultry port town on the Río Amazonas, Iquitos is quite probably the world's largest city that cannot be reached by road. The city has nearly...