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Ruffed Lemur (Varecia Variegata), Andasibe-Mantadia National Park, Toamasina Province, Madagascar. Insights / Universal Images Group / Getty Images

By Andrea L. Baden

The island of Madagascar off the southeastern coast of Africa hosts at least 12,000 plant species and 700 vertebrate species, 80% to 90% of which are found nowhere else on Earth.

Isolated for the last 88 million years and covering an area approximately the size of the northeastern United States, Madagascar is one of the world's hottest biodiversity hotspots. Its island-wide species diversity is striking, but its tropical forest biodiversity is truly exceptional.

Sadly, human activities are ravaging tropical forests worldwide. Habitat fragmentation, over-harvesting of wood and other forest products, over-hunting, invasive species, pollution and climate change are depleting many of these forests' native species.

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Rod Waddington / CC BY-SA 2.0

By John R. Platt

For years now conservationists have warned that many of Madagascar's iconic lemur species face the risk of extinction due to rampant deforestation, the illegal pet trade and the emerging market for the primates' meat.

Yes, people eat lemurs, and the reasons they do aren't exactly what we might expect.

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A group of lemurs huddled up, ring tailed lemur, Lemur catta. Justin Lo / Getty Images

Ninety-five percent of Earth's lemur population is threatened, experts warned this week, underscoring their unfortunate position as the world's most endangered primates.

Of the planet's 111 known lemur species and subspecies, 105 can be provisionally evaluated as critically endangered, endangered or vulnerable, a group of primate specialists convened by the International Union for the Conservation of Nature (IUCN) determined.

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vil.sandi / Flickr / CC BY-ND 2.0

By Edward Carver

Lemurs in Madagascar have been under pressure from deforestation, poaching, drought and other challenges for years. Now, in the much-visited Berenty Reserve near the island's southern tip, one species faces a mysterious new threat.

In the last month and a half, at least 31 Verreaux's sifakas (Propithecus verreauxi) have died in the reserve. Most were found already dead; others were found gravely ill and later died from respiratory failure. Berenty staff and local scientists have reached out to veterinarians and primatologists across the world. The experts believe that a parasite or tick-borne disease is likely to blame, but the exact cause remains unknown.

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