Biological robots draw inspiration from natural systems to mimic the motions of organisms, such as swimming or jumping. Improvements to biobots to better replicate complex motor behaviors can lead to exciting biorobotic engineering applications to help solve real world challenges. However, this requires the creation of biohybrid, which is a challenge. Researchers combined an intact rat spinal cord with a tissue-engineered, 3D muscle system. They describe the novel biohybrid system in the journal APL Bioengineering.