On his Flight404 blog, Robert Hodgins says:
I set up a Processing driven webcam outside my kitchen window to view the nesting and maternal instincts of the common city pigeon. Here you can see the fruit of that labor. Oh, and I stuck a fez on her head too.
View the LIVE pigeon cam here. View the LIVE pigeon cam with dynamically added fez here.
Or if you are impatient or if its night time in San Francisco or if the pigeon landed on the cam and moved it while I was away or the feed stops working, you can see a short timelapse video here.
Link to blog post, via wemakemoneynotart.