When I first arrived at Microsoft I had a few days to settle in before I actually started work. I took the opportunity on one of these days to wander through the campus so I would know where to go on my first day, and to just explore a little. At one point on my walk I noticed a squirrel sitting on top of a fencepost staring it me, its eyes following me as I walked. I wondered (not seriously) if it was a robotic squirrel invented by the research department.