I think it is more "flapping mouse", like the German "Fledermaus" what has it's origins in "vleder" (old German word for to flap).
I may end up with my innervoice reading dutch in batmans voice for at least the rest of the evening!
It sure is. Like how sometimes your parents are referred to as your elders.
Because niet qualifies verbs, geen qualifies nouns. Geen = none, no, not one, not any etc.