<p>➀ ETH Zurich researchers developed a four-legged robot named ANYmal-D that plays badminton with humans using reinforcement learning and a perception noise model; </p><p>➁ The robot's quadruped design enhances stability, while its stereo camera and dynamic arm enable precise shuttlecock tracking and hitting; </p><p>➂ Successful tests demonstrated continuous rallies of up to 10 shots, showcasing applications for legged robots in dynamic sports.</p>