From the current issue of National Geographic,

A city of limestone towers rises in western Madagascar…. Unexplored passages shelter some of the island’s—and the world’s—strangest species, from the ghostly Decken’s sifaka, a lemur, to a host of reptiles, insects, and plants….

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Photograph by Stephen Alvarez

Spiny, drought-tolerant Pachypodium plants… thrive in… Tsingy de Bemaraha national park and reserve in western Madagascar.