Remember Boston Dynamics' robotic pack mule Big Dog? The researchers have revealed the next generation of their mechanical quadruped, Alphadog. This remote-controlled equine machine is designed to carry 400 lbs of payload on 20-mile treks over uneven terrain. The primary benefit of Alphadog is that it's way quieter than the stentorian Big Dog, which sounded like a swarm of cyber-bees. This just a prototype of this DARPA-funded carrier bot, so don't expect the "brown noise whinny" peripheral to be finished yet.