[Trivial Psychic]

That really sucks. Poor little critter.

As En Sabah Nerd said, there might not be a lot you can do other than gluing it back on. If you are a wiz with sculpy and a dremel, that might work too.
Due to the rareity of this little fellow, I would try looking up Hasbro's customer service numbers and try getting someone on the phone to see if they can help. I have heard of toy companies in the past of sending completely new replacements in situations like this, and while I am unsure of Hasbro's service in these matters, maybe you'll luck out and find someone with a heart of gold on the other end. I mean, who would turn down helping this cute little critter?

Best of luck to you, and let us know how it turns out. I'm actually curious to see how Hasbro would respond to this type of situation.