HOWEVER, he recently figured it out, and now they're the best of friends. Like last night at bed time, I came in to kiss him goodnight, and he was on the bed, holding Coco and reading a science book. He beamed up at me, saying, "MAMA! I'm teaching Coco to read!"
Then he proceeded to plop her down on the book with each syllable, "Plu- TO- ni- um!"
We will have the smartest hamster ever.