I am not sh**ing you. DARPA, the folks who brought you the internet and The Sea Shadow, are planning to build self-feeding steampunk flesh-eating robots.
The EATR (still not sh**ing you), or "Energetically Autonomous Tactical Robot", is designed to perform long-distance missions of an unspecified type, and powers itself by picking up "biomass" along the way. That means wood, plants, and corpses.
The best part is, they use the flesh to power a steam engine, which means stempunk technology!
These babies will certainly still be roaming through post-apocalyptic aftermath type #1, so we'll have to make plans accordingly.