action at the window feeder

I put this window feeder up about 2 weeks ago and finally today the birds decided it was good food. I have yet to put up a feeder that the squirrels can't get into and this one is no different. Skippy had fun watching the squirrel from 2 inches away on the other side of the window glass. The squirrel didn't care a bit! By the way - how many sparrows do you think can fit in an 8-inch window feeder? (Answer: a lot!)