What about the sheep? I've always wondered why the Soay sub-species ended up stranded on the island of Hirta.
Most people agree that they were taken there by early farmers, but why were they left there to run wild? Was it a similar story to the one you've described in Sweden? Perhaps the local population suffered some sort of disaster and died out, leaving the sheep as the only remnant of their culture. I guess we'll probably never know.