Boston Dynamics quadrupedal Big Dog Unmanned Ground Vehicle (UGV) looks pretty amazing in its videos. However, the smaller version, known as “Spot,” is even more mind-boggling.

The electrically powered Spot is faster and quieter than the gas-fueled Big Dog. Weighing only 160 pounds (Big Dog is 240), Spot displays an impressive agility while navigating stairs, crossing rough terrain and especially righting itself after being kicked (one commentator suggests that since the robot rebellion is inevitable, it is unwise for Boston Dynamics to abuse them).

One of the main arguments against UGVs with legs is their lack of robustness and engineering simplicity as compared to their wheeled counterparts (for more on this debate, see Walk n’ Roll). The progress Boston Dynamics has made with Spot and Big Dog undermines this contention. Go, Spot, go.