I work in a warehouse, on a fairly small airport. This means lots of open field space, and fields mean these tiny mice. Most of them are too light to set off the traps we leave for them. More often then not they simply eat the bait and leave the trap still set. This one managed to climb completely inside a trap before it's tail set off the spring. If you look close enough you can see the world reflected it its eye. No really, look closer. .. Released it to the other side of the field after this, and it had the impertinence to stop and groom before scampering away.