Drinking my morning coffee, I noticed a bird on my back deck with a large twig in its mouth. A few minutes later when it clicked (I was on my first cup), I went out and looked inside the grill, where I found a nest construction project that was well under way. They’ll be doing the same thing at the airport, in your engine cowlings (and any other openings into the fuselage that they can find). It was a great reminder to check carefully for avian urban renewal efforts before our spring flights.
Now to see if the impromptu cowl plugs I put in the grill vents were effective….