According to Google, there's a Tick character named Die Fledermaus.
Strange, I always thought he was a bat, not a field mouse...
Which is the point. "Fledermaus" is german for "bat" (literally, "flying mouse", I believe). "Die Fledermaus" is also the name of an opera.
If I'm not mistaken, they changed the name of Die Fledermaus in the non-cartoon Tick. Probably because no one would understand the reference.
-AbyssDragon
Strange, I always thought he was a bat, not a field mouse...