>They eat the H&ll out of my lawn mowers. Some reason
> they like spark plug wires.

This is a good reason why they are not fun and games.  There seems to be a rodent instinct to shred things that are soft for nesting materials.  The rubber and plastic insulation on vehicle and house wires make nice little mouse futons.

They also need a hole only slightly larger than their heads to get in.

Been there with RATS (yecch!).

Tom Salicos