The yellow spider monkey - just one of more than 200 mammal species living in Bolivia's 19,000 square-kilometer Madidi National Park. The preserve is also home to a staggering 11 percent of the world's birds, like the green-winged macaw. It also boasts 300 species of fish, 12,000 different kinds of plants and countless reptiles. All this richness has led scientists to declare that Madidi might be the most biodiverse region on Earth.
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