If you ever get the chance look in a Pack Rats nest.
One in my little stable had candy bars, nuts & bolts, washers, grain, a penny, two nickles, an old leather belt, small paper back book, acorns & Hickory nuts, bottle caps and wooden clothes pins.
Plus they can be VERY destructive. Ate the wiring on each side of the harness of my old Ford 5000 where it plugged into each other. $857.35