The squirrel has turned up on the window sill a few times and I've tried to throw peanuts out to it, but it's always run off and the birds have quickly snapped up the nuts.
Today, for the first time, the squirrel put in an appearance and then climbed up on to the drainpipe to wait. I carefully opened the window and put a small handful of nuts on the sill. A moment later, the squirrel came down and sat on the sill while it ate them, apparently unperturbed that I was a mere 3 feet away on the other side of the glass. It still seemed to be hungry, however, so having finished the first batch, it actually scratched at the window frame before running off. I put out another helping and it returned and ate those too.
I has a pet! I shall call him Squiggy after the little felt squirrel my mother made for me when I was small. I have made Squiggy an icon. :)