Less depressing, though hair-raising, are these robots that hunt and feed. One of the robots, created by the James Auger and Jimmy Loizeau designer team, is disguised as a table. Crumbs placed on the table lures unsuspecting mice to crawl up on the table and when the table-bot senses it's prey, it opens a trapdoor and the mouse fall in. The robot can digest the mouse with a microbial fuel cell, giving it energy to hunt more mice.
(Note: none of the robots can eat human beings.)