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Cave animals in nature have excellent digging and inverting function,and its claw toes have similarities with sampling shovel on structure,function and loading.The article selected the claw toes of Himalayan marmot as biological prototype of optimization design of sampling shovel on Mars,and then it use 3-D Laser Scanner to obtain its characteristic point cloud data of the second front claw toe,building three-dimensional model of claw toes,fitting the internal and external contour lines of claw toes with cubic polynomial.