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Crab locomotion research. Ghost crab (Ocypode quadrata) on miniature obstacle course. The adjustments the crab makes to the uneven surface of the course are being studied here. This is being done to aid the development of robots that mimic animal forms of locomotion for traversing difficult and varied terrain. Photographed in 2005 at the PolyPEDAL Lab, University of California at Berkeley, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/VOLKER STEGER)