They're putting guns on robot dogs now

Quadrupedal robots are one of the most interesting developments in robotics in recent years. They're small, nimble, and able to traverse environments that frustrate wheeled machines. So, of course, it was only a matter of time until someone put a gun on one. The image above shows a quadrupedal robot -- a Vision 60 unit built by US firm Ghost Robotics -- that's been equipped with a custom gun by small-arms specialists Sword International. It seems the gun itself (dubbed the SPUR or "special purpose unmanned rifle") is designed to be fitted onto a variety of robotic platforms.