A couple of tidbits....

1. Neil taught him this one: When we sing "Ba-ba-ba-ba-ba" (to the tune of "Shave and a haircut"), Ben responds with "Ba-ba!" It's too funny.
2. Ben has a friend named Cal, who is about 6 months older. When you ask Cal, "What sound does a horse/cow make?" he makes the appropriate sound. So yesterday, when Ben was having fun making some growling noises, I asked, "What sound does the lion make?" (Coincidentally, we had a book opened to a page with a lion on it.) When he growled, I said, "Very good!" and he picked up on it. So now whenever we ask about the lion, he growls! (Thanks, Cal, for the inspiration!)