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Having been isolated for over 80 million years, the unique biota of Madagascar poses many interesting questions to those who study biogeography. This Madagascar Tree Boa (Sanzinia madagascariensis) is one of four species of boas present on the island, noteworthy because by contrast the large constricting snakes of the nearest landmasses (Africa and Asia) are all pythons. Herpetologists don't yet know the answer to this enigma, but recent evidence supports one theory that boas may have existed on Madagascar in the ancient past when it was still connected to Gondwanaland. Ranomafana National Park, Madagascar.

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© Chien C. Lee
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Reptiles, Madagascar
Having been isolated for over 80 million years, the unique biota of Madagascar poses many interesting questions to those who study biogeography. This Madagascar Tree Boa (Sanzinia madagascariensis) is one of four species of boas present on the island, noteworthy because by contrast the large constricting snakes of the nearest landmasses (Africa and Asia) are all pythons. Herpetologists don't yet know the answer to this enigma, but recent evidence supports one theory that boas may have existed on Madagascar in the ancient past when it was still connected to Gondwanaland. Ranomafana National Park, Madagascar.