How about packrats? I did some interesting research on packrats a good many years ago. One interesting story was about the gold miner who upon emptying his pockets overnight on his stand in his shack out west was surprised to find that something had taken a bolt that he had on the stand. In it's place was a small gold nugget. The same thing repeated itself the following night. He went to his small coffee can, pulled the plastic lid off and started leaving either nuts, bolts or washers on his stand before he went to bed. For a good many nights he was rewarded with gold in place of nuts, bolts or washers. I'm sure the packrat either ran out of gold nuggets or got tired of nuts, bolts and washers. It was a very interesting article. They like pretty shiny things. Just one more way of utilizing treasure hunting skills. Find a packrats nest and you might be surprised whats been accumulated!