Wildcat

Wired:

Last year when DARPA released video of its new robot designed to replicate the movements (and, eventually, speed) of a cheetah, some of us were creeped out by the machine’s ability to “chase and evade” at the rate of nearly 30 mph.
The only thing reassuring was that the Cheetah was tethered by an electronic leash of cables. Now MIT spinoff Boston Dynamics has released WildCat, the sequel to Cheetah, which can only move at 16 mph at the moment, but can do so while untethered.
Funded by DARPA, WildCat uses a combination of galloping and bounding to move and gain speed, as the video below shows, and can already recover from from stumbles and falls with ease.