"Ah..but my favorite animal might be different from his favorite animal. I'm not sure I can be much help in that way." While the same they are still ultimately different.

"You'd probably be safe to just carve a rabbit." Since at least that is something he knows they bonded over..or he assumes they did. Except now he isn't entirely sure of that himself. Their teenage years seem to be the ones with the most divergences. "He did bring you rabbits right? To the library, when we were studying there?"