That's a big baby. It seems it is comfortable enough with it's surroundings. I have never scene a squirrel do that. Even the squirrels near me don't sit still for too long a time.
I have a gorgeous red one I have been trying to get a picture of. It has been around for a few years now.
Yeah, it was pretty surprising how long it sat still for,it only moved when my niece opened the door to go and play in the garden. Hopefully, he comes back soon :). I hope you get some shots of the red squirrel :).