When I was a kid I used to collect butterflies. When dad went overseas I went over for a few holidays there and, of course, caught some more for the collection. Knowing it was illegal to import insects back to Australia and not wanting to throw them out, I left them in what I thought was a rqrely used book at his house packaged in non stick paper and forgot they existed. Years later dad came back home to live and you can imagine the surpsrise to see the book and the preserved specimens still neatly slotted into some pages.
