Boston Dynamic’s BigDog is already an impressive and freakishly animal-like beast, but Darpa it seems has bigger plans in mind and is asking for a smarter, bigger BigDog. The upgraded robot needs to carry 180kg of payload, run 32km on any terrain and survive un-refueled for a whole day to please Darpa’s request. Plus it must be way quieter so it’s more useful in real combat situations and have a smarter brain so it can steer itself autonomously as it trots after its soldier masters.