If you spend enough time traveling and go to enough places you will eventually be invaded by unwanted guest. Not all places have these undesirables but when it happens it becomes a war of determinations. The first encounter with an invading species happened even before we bought our per-owned coach from a very nice couple living on a ranch in Colorado. Ranches have mice and so did the RV we were considering. Not only was there evidence of their presents scattered about, but one little rascal darted...