Ghost crab burrows on a beach at sunrise. Ghost crabs (Ocypode quadrata) emerge from their burrows to feed at night. The only evidence of them during the day is the piles of sand excavated from their burrows. Photographed on Abd al Kuri island in the Socatran Arcipelago. Abd al Kuri measures 133 square kilometres in size. Socotra is located in the Indian Ocean at the mouth of the Gulf of Aden, 340 kilometres (km) from mainland Yemen and 250km from the coast of Somalia. (KEYSTONE/SCIENCE PHOTO LIBRARY/DICCON ALEXANDER)
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