A squirrel is featured in the 2007 Topps Update set. We kid you not.
It's apparently as rare as the albino squirrels which inherit one southern Illinois town from time to time.
A "Poley Walnuts" card has been released--sort of--in the 2007 Topps Update set. There is also a variation in just who is featured on card #100, Red Sox phenom Jacoby Ellsbury or Phillies' third baseman Abraham Nunez.
TNT Sportscards reps went nuts trying to find more than one squirrel card and bonkers over the rare Bosox rookie card. They report finding only one squirrel card (we can't believe we just typed that) in 20 cases.
A few have shown up on eBay already and collectors haven't been shy about bidding on them.