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Cover: Spiders use their special hydraulic system to achieve superior locomotor performance and high drive efficiency. A study by Xin Hao and colleagues explored the energy conversion during the hydraulic drive of spiders (Haplopelma hainanum). It was found that for spiders, the bouncing gait and the hydraulic system contribute to the lower transport cost at low speed, while the hydraulic system greatly increases the transport cost at high speed. Image licensed under a Creative Commons Attribution 4.0 International license.