I'm guessing they were just having a big laugh.
As scientists I imagine they weren't fond of politicians, singers and other celebrity wankers who were likely to be using microphones. They spent the rest of their lives rolling around laughing at all these people with their mouths millimetres away from big metal cocks.
Microphones should really be in the shape of an ear and probably not a human ear because our hearing is pretty crap. I reckon something in the shape of a fox ear is bound to work pretty well. It would take a while before people got used to fox ear shaped microphones, but it would make way more sense.