Boston Dynamics’ BigDog started life as a headless four-legged robot capable of hauling soldiers’ gear along rough and uneven terrain. The BigDog’s upgrades and follow-on robots are expanding the boundaries of robotic motion, initially with cash from Darpa’s Tactical Technology Office. Its quadruped packmate the Cheetah can outrun Usain Bolt. Its cousin the Legged Squad Support System can follow voice commands. Its big brother the AlphaDog can stand up from a prone position.

But the BigDog has some new tricks: like, um, throwing a cinderblock, as shown in the video above that Boston Dynamics released Thursday. And the robot also a head. Kind of.