Seemingly in my spare exhaust can! I was moving some bits around in the garage and thought "funny, that shouldn't rattle" I shook a good handful of mixed nuts out of the silencer.
I get that all the time in air con outdoor units. It may be a mouse....Squirrels normally bury theirs like a dog with a bone.
There's still a couple rattling round in there, I/m tempted to fit them and go round shooting cars behind me
I've heard of people starting their bikes after winter and a mouse near shoots out of the exhaust , also an rc45 owner advertised in the rc30 owners club for various parts required due to mouse attack.
I can remember an almost zero mileage AC Cobra coming back in to the works for a complete leather retrim as a mouse/mice had trashed all of the seats, always at the seams, where the tasty glue had been applied.