 What's a crawler?
A crawler is a two-legged robot that avoids the problem of balance. Part of the robot rests on the ground and the robot's legs pull it along. The motion of the robot isn't elegant but the robot is simple and very light. It sounds ideal. But, crawlers are not without their own problems. For one thing, the friction of the robot dragging itself along the ground could cause it damage and also, the robot will consume lots of power as it has to overcome the friction force with the ground dragging it backwards. In short, crawlers are a stable but not very efficient way of getting around.
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