One reasons chipmunks and red squirrels eat the coating from electrical circuit wiring is that the coatings are made from a soybean extract-- the little buggers are attracted to that--RWTF
And field mice. Out West guess Pack Rats as well.
2 weeks ago picked up my Polaris Ranger Northstar Trail Boss that was ordered in Oct. of last year. The business manager tried to sell me an extended warranty and went over everything that was covered. When he finally finished I asked what wasn't covered and he said damage caused by rodents because that was neglect. I told him BS the damage is caused because they are putting food on the wiring and Polaris (and other manufactures) is at fault. I declined the extended warranty. I guess some insurance policies will cover it but then of course your premium will go up.