You know that kindergarten game of "telephone" where you whisper into your neighbor's ear until the story morphs? I think that's happening with "shave and a haircut" in my little flock. Sunny has started chirping something that isn't a whistle, but sounds remarkably like it. I think the budgie flocks I let them watch all day on YouTube have it worked into their birdie language on our favorite channel. I'm glad I've been skipping flocks that have annoying chirps.