I'm afraid you'll have to fire the elf who told you that butterflies are called "Milchdieb" in Germany. I've lived there most of my life and never heard that expression. The German word for butterfly is "Schmetterling." By the say, the most common butterfly in Europe is a small species that varies in color from ivory to deep yellow-- all the colors of the butter spectrum, so to say.
-- Simone Shoemaker, the Net
I suspect the elves steamed open your e-mail before I could get to it. When I went to grill them, they'd already grabbed their skateboards and hit the road. According to the note, they've gone to Hussong's to look for gulls. Anyway, inquiring again at the Matthew Alice Leaping Lepidopterists and Two-Minute Lube Center, turns out the butterflies of Berlin used to be called "Milchdieb," "milk thief." Well, the bugs don't know the difference anyway.