Photo: Bug-Eating Robots Use Flies for Fuel

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Slugbot, a robot that hunts common garden slugs, is the first so-called Ecobot developed by the U.K.'s Bristol Robotics Laboratory. Slugbot can't actually digest its prey, but two more recent prototypes can convert biomass—like dead flies and other waste—into electricity through a series of stomachlike fuel cells.

Photograph courtesy IAS Ecobot Team

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