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This study hypothesizes that the gait and belly\u2010dragging posture of tortoises can improve the energy efficiency of robots. To test this hypothesis, a quadruped robot mimicking these tortoise characteristics is developed, utilizing the cost of transport (CoT) as a measure of energy efficiency. Dynamic simulations and real\u2010world experiments are conducted, varying parameters like robot size, mass, friction coefficient, and Froude number, to validate the generality of the findings. The results indicate that both belly dragging, a postural characteristic of tortoises, and their diagonal gait significantly lower the robot's CoT. This suggests that the energy\u2010efficient locomotion of tortoises, specifically the diagonal gait with belly dragging, is transferable to robotic platforms to enhance energy efficiency. The tortoise\u2010inspired robot design offers significant potential in applications such as search and rescue operations, space exploration, and payload transportation. 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