The Ostheimer mice just might be the smallest of all the Ostheimer creatures (okay, tied with the Ostheimer chick).
It's nice to have ~3 mice for the telling of the Pied Piper story. If you haven't done storytelling with Ostheimer figures before, just start with a story that appeals to you, and one that you know well or are interested to learn. We find the stories and dialogue need only be simple for young children.