Check it out: Military's robotic 'pack mule' goes on hike

UNDATED (CNN) -- Check out this video from the U.S. Department of Defense research arm known as "DARPA"!

This robotic mule is one of a few four-legged robots designed to climb rough terrain -- without wheels!

DARPA says two prototype "pack mules" like this one have less noise and better climbing ability than earlier models.


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