Comment by iamwil

Your comment got me thinking. From a technical point of view of traversing over unknown and uneven terrain, there really is no reason to go with bipedal, especially if it's easier to do control systems for tri or quadraped robots. Of the handful that can be bipedal (primates, bears, birds), it's not their preferred mode of movement. However, it's probably a psychological disadvantage for the robots to be 3 or 4 legged and work along side humans in a job that requires it to be treated as a human, like a waiter, house companion, etc. That alone is reason enough to continue bipedal robotic research.