Milt,
Based on my usual bush flying passengers, flies come as a part of the deal if you know what I mean.
I do know that the relative size of a little black blowfly sitting on the windscreen is way out of proportion to the size of him after he has been smashed with a rolled up ERC chart. I also learned it is much easier to just let them sit quietly subdued in the thin air rather than try and remove a smear that just seems to keep smearing rather than coming off.
The last shuttle mission had a load of aussie spiders on board conducting zero "g" web spinning experiments but the results of that would be lost forever I think.
cheers
Vic