Remote Controlled Rats
sclatter writes: "They aren't precisely robot rats, but
these little rodents can be cued to perform different actions through electrodes implanted in their brains. Could be a boon for search and rescue in collapsed buildings!" As one skeptic in the article says, though, "Without the gee-whizery, without the remote-control and so on, that this kind of thing was possible has been obvious for decades."
This was also done with cockroaches.