Above: The Sumatran tiger, of which there are about only 400 left in the world

Indonesia’s tropical forests are the world’s third-largest and the most ecologically important after those of the Amazon and Congo basins. Their biodiversity is astonishing, with 515 mammal species — the most of any nation — and 1,539 bird species. Alas, Indonesia has another more dubious distinction: It also ranks fourth on the list of countries with the most species in imminent danger of extinction.

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