Why Engineers Steal from Nature
https://youtu.be/WzorI-l9YLI?t=673
At the timestamp begins a discussion of when Frank Stephenson put a sailfish in a wind tunnel and what was learnt.
Silencing the air intake is one thing, but the second is potentially ecomodder friendly: Silencing the rear view mirror stalks with aeroform blisters with a 1:1.618 fineness ratio.