AUTHOR=Muscolo Giovanni Gerardo , Ceccarelli Marco TITLE=Editorial: Mechanics of Legged Robots: From Bio-Inspiration to Novel Legged Machines JOURNAL=Frontiers in Mechanical Engineering VOLUME=7 YEAR=2021 URL=https://www.frontiersin.org/journals/mechanical-engineering/articles/10.3389/fmech.2021.667164 DOI=10.3389/fmech.2021.667164 ISSN=2297-3079