OCD!?

For those of you who are unfamiliar with our little boy, he's obsessed with having things in rows...blocks, puzzle pieces, shoes, cars, etc. The other day he had lined up all his blocks so that the animals were all facing out. The non-animal blocks (which are pretty much useless in his eyes) were set aside...except for one. Can you see the one that shouldn't be there??? I of course that it was funny and had a take a picture!!