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Indris and other lemurs are only found on the Comoro islands and Madagascar, an evolutionary mad-house that began breaking away from Africa about 160 million years ago, becoming its own version of Noah's Ark as it drifted out into the Indian Ocean.
"Madagascar is truly the naturalist's promised land," wrote the naturalist Joseph Philibert Commerson in 1771. "Nature seems to have retreated there into a private sanctuary, where she could work on different models from any she used elsewhere."
Madagascar has no deer or antelope species, and also lacks large predators. Poisonous snakes are absent as they are a relatively recent evolutionary development.
Madagascar also boasts half of the world's roughly 135 species of chameleons. But the lemurs are what really draw wildlife enthusiasts to this island.
Regarded as "primitive" primates, some 50 surviving species of lemurs make their home in Madagascar. Kin to monkeys, apes and humans, their behavior and characteristics shed vital clues on our own distant past.
But 15 species of lemurs have become extinct since sea-faring humans who originated in present-day Indonesia arrived on Madagascar's shores about 2,000 years ago.
Humanity is still wreaking ecological destruction on the island, as a swelling and desperately poor rural population hacks away forests, creating what some environmentalists say is the most heavily-eroded place on the planet.
For the lemurs, the last chance for survival may lie in the employment and cash generated by eco-tourists who come from afar to view them.
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