Dave is - as always - right:
This where the
Elster (German for magpie, a thieving magpie is a "diebische Elster") lives. My guess is that they reached the Western US via Siberia/Alaska, a Communist bird then in the land of the free. They're great survivors - you won't get rid of them ever!
Serves you right for flooding us with your darn Colorado beetle and racoons.