Legged robot

Legged robots are a type of mobile robot. They are somewhat a recent innovation in robotics. However, many or all bipedal models are not practical because they are cumbersome and slow. Most successful legged robots have four or six legs for further stability. This legs-over-wheels approach lends itself for use in all-terrain purposes because legs are more effective in an uneven environment than wheels.

Legged robots include:

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Wikipedia