  While most micro-robots face difficulty traveling on rugged and uneven
terrain, beetles can walk smoothly on the complex substrate without slipping or
getting stuck on the surface due to their stiffness-variable tarsi and
expandable hooks on the tip of tarsi. In this study, we found that beetles
actively bent and expanded their claws regularly to crawl freely on mesh
surfaces. Inspired by the crawling mechanism of the beetles, we designed an
8-cm miniature climbing robot equipping artificial claws to open and bend in
the same cyclic manner as natural beetles. The robot can climb freely with a
controllable gait on the mesh surface, steep incline of the angle of 60{\deg},
and even transition surface. To our best knowledge, this is the first
micro-scale robot that can climb both the mesh surface and cliffy incline.
