Matching Bag

Photo and Idea Source: Little Hands, Big Work

Just like a matching game with cards. You start by pulling out a critter from the bag then just "finding" it's match by only feeling inside the bag. If you get a match AWESOME if not both pieces go back into the bag.

                                                                              OR

You could put each critter out on the tray and then have it's mates inside the bag,  trying to get a match that way.