Photos: Pleo, the sensitive robot

When it's in a good mood, the Pleo wags it tail back and forth. It also makes a sort of mooing sound, which is appropriate given that the robot is modeled after the Camarasaurus, a cow-like dinosaur that roamed the Americas in the Jurassic period. A paleontologist helped Ugobe come up with the design.

Photo by Michael Kanellos/CNET News.com