BirdBot, an energy-efficient robot leg inspired by birds' legs 

Publication: Badri-Spröwitz, A., Sarvestani, A. A., Sitti, M., & Daley, M. A. (2022). BirdBot achieves energy-efficient gait with minimal control using avian-inspired leg clutching. Science Robotics. doi.org/10.112...
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CAD files are available for non-commercial use edmond.mpdl.mp...