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Tortoises at Dawn, Galapagos Islands, 1984..Giant tortoises in pond, Geochelone elephantopus, Alcedo Volcano, Galapagos Islands.."The Galápagos Islands provide a window on time. In a geologic sense, the islands are young, yet they appear ancient. The largest animals native to this archipelago are giant tortoises, which can live for more than a century. These are the creatures that provided Darwin with the flash of imagination that led to his theory of evolution. ..Immutable as the tortoises seem, they were utterly vulnerable to the buccaneers and whalers who took them by the thousands in the last two centuries. But one population eluded them. Inside the Alcedo volcano on Isabela Island, an earlier era lingers. This caldera is sealed off from the outside world by steep lava slopes that rise to 3,860 feet on the equator. It was not until 1965 that an Ecuadorian biologist found a way down inside and discovered a world where giant tortoises roamed in primordial abundance. This group had presumably never

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Uploaded on October 14, 2014