I have a few other cars in the driveway, and had a couple issues with voles (like mice) and squirrels. The voles have chewed up hood liners to make a nest, and squirrels have left walnuts in the engine compartments. For the cars not driven a lot I leave a mouse trap in the engine compartment. I've never had an evidence of one in the garage but I leave traps around inside as well. Others on the forum have reported major damage from critters eating wires.