BigDog is a dynamically stable quadruped robot created in 2005 by Boston Dynamics with Foster-Miller, the NASA Jet Propulsion Laboratory, and the Harvard University Concord Field Station. BigDog is funded by the Defense Advanced Research Projects Agency (DARPA) in the hopes that it will be able to serve as a robotic pack mule to accompany soldiers in terrain too rough for conventional vehicles. Instead of wheels or treads, BigDog uses four legs for movement, allowing it to move across surfaces that would defeat wheels. The legs contain a variety of sensors, including joint position and ground contact. BigDog also features a laser gyroscope and a stereo vision system.
Boston Dynamics Big Dog (new video March 2008)
http://www.youtube.com/watch?v=W1czBcnX1Ww
DARPA's Amazing Robot Pack Mule Keeps its Balance On Ice
http://www.popsci.com/military-aviation-space/article/2008-03/darpas-amazing-robot-pack-mule-keeps-its-balance-ice
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