Qualla: Sulawesi's Cloud Forests: Evolution's Island Laboratory

Sulawesi's Cloud Forests: Evolution's Island Laboratory: Introduction

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Feby cloudy, CC BY-SA 4.0. In 2008, a research team from Texas A&M University hiked into the mossy highlands of Mount Rorekatimbo in central Sulawesi, set mist nets in the cloud forest, and caught something that had not been seen alive in over eighty years. Three pygmy tarsiers, tiny primates with enormous eyes and claw-tipped fingers, materialized from the fog like proof that this island still keeps secrets. The species had been presumed extinct since the 1920s. One had been accidentally killed during a rat-trapping expedition in 2000, hinting at survival, but until Sharon Gursky and Nanda Grow fitted radio collars to those three startled animals on Rorekatimbo, no scientist had confirmed a living population. The montane rain forests where the pygmy tarsier hid are themselves a kind of biological riddle, shaped by forces unlike those that built any other forest on Earth.

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Image: Feby cloudy | CC BY-SA 4.0

Sulawesi's Cloud Forests: Evolution's Island Laboratory: The Line That Changed Biology

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Feby cloudy, CC BY-SA 4.0. In the nineteenth century, the naturalist Alfred Russel Wallace noticed something strange about the animals on either side of a deep strait west of Sulawesi. To the west, in Borneo, the fauna was unmistakably Asian: monkeys, tigers, rhinoceroses. To the east, in Sulawesi and beyo...

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Image: Feby cloudy | CC BY-SA 4.0

Sulawesi's Cloud Forests: Evolution's Island Laboratory: A Forest Built on Isolation

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Every-leaf-that-trembles, CC BY-SA 4.0. Sulawesi is the fourth-largest island in Indonesia, 180,681 square kilometers of land twisted into four peninsulas radiating from a mountainous core. The highest peak, Mount Latimojong, reaches 3,478 meters. Roughly 40 percent of the island's land area falls within the montane ra...

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Image: Every-leaf-that-trembles | CC BY-SA 4.0

Sulawesi's Cloud Forests: Evolution's Island Laboratory: Creatures That Exist Nowhere Else

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Feby cloudy, CC BY-SA 4.0. The numbers are staggering. Ninety-eight percent of Sulawesi's nonvolant mammals are endemic to the island. The montane forests alone harbor 102 mammal species, a third of them found here and nowhere else. Beyond the pygmy tarsier, there is Dian's tarsier, another highland primat...

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Image: Feby cloudy | CC BY-SA 4.0

Sulawesi's Cloud Forests: Evolution's Island Laboratory: Guardians in the Mist

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Feby cloudy, CC BY-SA 4.0. Only 12 percent of the montane ecoregion falls within protected areas, roughly 9,066 square kilometers as of a 2017 assessment. Lore Lindu National Park, where the pygmy tarsiers were rediscovered, is the most prominent, but the network extends across the island: Bogani Nani Wart...

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Image: Feby cloudy | CC BY-SA 4.0

Sulawesi's Cloud Forests: Evolution's Island Laboratory: Between Two Worlds

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Feby cloudy, CC BY-SA 4.0. Seen from above, Sulawesi's four peninsulas splay outward like the arms of a starfish, each wrapped in green where the mountains rise high enough to catch rain and cloud. The montane forests drape these highlands in a living cloak that has been accumulating species for millions o...

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Image: Feby cloudy | CC BY-SA 4.0