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Madagascar's long isolation from the neighbouring continents has resulted in a unique mix of plants and animals, many found nowhere else in the world. This has led some ecologists to refer to Madagascar as the "eighth continent". Of the 10,000 plants native to Madagascar, 90% are found nowhere else in the world. Madagascar's varied fauna and flora are endangered by human activity, as a third of its native vegetation has disappeared since the 1970s and since the arrival of humans 2,000 years ago, Madagascar has lost more than 90% of its original forest.
Most lemurs are listed as endangered or threatened species.The eastern, or windward side of the island is home to tropical rainforests, while the western and southern sides, which lie in the rain shadow of the central highlands, are home to tropical dry forests, thorn forests, and deserts and xeric shrublands. Madagascar's dry deciduous rain forest has been preserved generally better than the eastern rainforests or the high central plateau, presumably due to historically low population densities.
