I removed a couple of mouse nests when I restored my TR4A frame, and more in the rusted rocker panels. Most disturbing, though, was what I found behind the passenger-side pedal board in my Porsche 912, when I redid the interior: an old rat's nest with a number of little ratty skeletons in it. They were long dead by time I got the car, but I can't imagine that the PO didn't smell something, at some point. I also found empty pecan shells behind the engine--the car came from Las Cruces, NM, which is a big pecan-growing area.