Considering how much Peanut loves to sleep in a small, enclosed space (i.e., a hand with a blanket on top) I've always assumed that he'd like to play in other enclosed spaces. But for the most part, this isn't the case. I've gotten a few small enclosures for him, but unless there are snacks inside, he isn't interested.

The same is true for this coconut, which was sold in a pet store for mice. I hide snacks inside, but the closest he's ever gotten is to stand with one foot on the bookcase and the other on the edge of the opening. That is, until today! You can click on this picture for a bigger version. He squeaked, he turned around a few times, he squeaked some more, and finally climbed out. He may have been checking it out as a nesting site, but it's hard to say.