In fairness, new DoD killer robots are omnivores:

Robotic Technology Inc.’s Energetically Autonomous Tactical Robot — that’s right, “EATR” — “can find, ingest, and extract energy from biomass in the environment and other organically-based energy sources, as well as use conventional and alternative fuels such as gasoline, heavy fuel, kerosene, diesel, propane, coal, cooking oil, and solar when suitable,” reads the company’s Web site.

via Military Robots to Feed on Human Flesh « Aftermath News.