KBlaix - he definitely isn't a polecat; we do get martens, stoats and weasels around here, but we are certain he is a domestic ferret.

Here is the little cutie himself (sorry for bad pic quality, it's taken in my garage where the lighting is awful, and he is very fidgety!):



I've put in a fruity-tasting chew which Flossie didn't like and a cat toy which used to be Zsa-Zsa's, but I'll see if I can get him any better toys, if we end up having him for a few nights.

ETA: thanks Courtney! I'll go and boil him an egg now. Flossie loves hard boiled egg too, so they can share.