A headless robot dubbed "Cheetah" has set a new world speed record, according to its owners.The US Defense Advanced Research Projects Agency said the four-legged machine achieved 18mph (29km/h) on a laboratory treadmill.
The agency said the previous land speed record by a legged robot was 13.1mph.
Darpa said that the project was part of efforts to develop robots designed to..
"more effectively assist war fighters across a greater range of missions".
Darpa - which is run by the Pentagon - funded the Massachusetts robotics company Boston Dynamics to build the machine.
"We plan to get off the treadmill and into the field as soon as possible," said the firm's chief robotics scientist, Alfred Rizzi, in a statement.
"We really want to understand what is possible for fast-moving robots."