Ha! I don't know about swimming, but I do know the gray ones are a LOT fatter here in the north than they are in Florida. Guess they need all that fat to keep warm when it snows. Wonder if mice need more fat in the winter?!
Hi Caren - I have a strip sketched out about a fat squirrel! Maybe I'll do it someday. I like the idea of Cheese fattening up for the winter. Do you get dormice in the US? They get REALLY fat for the winter.