Marine Iguana Colony Night and day Marine Iguanas often sleep in large huddles to conserve heat. They try to maintain a 95 degree F body temperature, but in the cold Galapagos waters their body temperatures can fall by as much as 20 degrees. When they get warm enough they sit facing the sun with their body elevated to catch the breeze. If this doesn't work they look for a shady spot or crawl into a crack in the rocks. Puerto Egas, Santiago Island.
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