Not sure what this dude is. Like all of you I have probably seen a million squirrels but none like this. I guess maybe he lost his fur to disease or parasites. I prefer to think he is a cross between a squirrel and a rat.
A grab shot if there ever was one as it was 2 shots under exposed.
20D,100-400 @ 400, 1/500, f/5.6, ISO 400