We have been back in Iowa from Fla for about two weeks. I have learned to watch for birds who seem to know when we arrive back here!
We have been watching a few birds hanging about the back part of the bus but have not found any evidence of them setting up residence until today. The wife saw a bird fly out of the exhaust pipe! I took a look, pulled out a couple hands full of straw etc. Fired up the engine and out came a pretty large quantity of straw, grass and other assorted trash.
I guess this one needs to go on the list of quick fixes etc

Will be fabricating a removable screen insert for the exhaust pipe.
On a prior MH we had a full nest in the air intake of the generator. I had wondered for some time how "trash" was showing up around the sheet metal of the generator. would clean it out and find it again soon after running the gen. Found the entire air intake had been made into a nest. Something to be always on the lookout for.
Keep a watchful eye!!! Your mileage may vary