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The Amazon represents over half of the planet's remaining rainforests and comprises the largest and most biodiverse tract of tropical rainforest in the world, with an estimated 390 billion individual trees divided into 16,000 species. One in ten known species in the world lives in the Amazon rainforest. This constitutes the largest collection of living plants and animal species in the world. The region is home to about 2.5 million insect species,tens of thousands of plants, and some 2,000 birds and mammals. One in five of all bird species are found in the Amazon rainforest, and one in five of the fish species live in Amazonian rivers and streams. Scientists have described between 96,660 and 128,843 invertebrate species in Brazil alone.