Here is an ultralight 6-legged robot that can traverse challenging indoor and outdoor environments. The Multilegged Autonomous eXplorer (MAX) stands 2.25m tall and weighs 60kg, so it is up to 20 times lighter than comparable robots. MAX has a body length of 1.2m and cruise height of 1.5m. It comes equipped with cameras and sensors to perceive its environment.
The robot is ideal for navigation planning for traversal of complex 3D terrain and other research projects. The above video shows it in action. More info is available here.