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-My Dad found the same thing out with his tractor. When he fired it up in the spring, he smelled something hot, then all of a sudden sparks and stuff started shooting from the exhaust pipe. He shut it down and pulled the muffler off. He found it was packed with dog food. The mice were robbing the dog's food and storing it in the exhaust pipe.
Haha, good stuff. Oddly enough I just pulled my squirrel cage fan off, because I smelled something... bad. The fan looked the same, I stuck my hand in the ducting where the fan was located and found the culprit. It had expired, but was still squishy.