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Here are five flora- and fauna-rich ecologies that Conservation International, a nonprofit organization in Arlington, Va., says are more than 70 percent intact.
2. Congo Basin
Second only to the Amazon in terms of area, the Congo Basin is home to biologically important species from large mammals - antelopes, elephants, and most famously, gorillas - as well as human communities and old growth forests. With a reach across seven African nations, it is only 11% protected - largely through national parks.
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