The gypsy trail Book

It turns out that almost everything we think of as "common knowledge" now about the disasters resulting from humans introducing foreign species was originally the work of C.S. Elton back in the mid 1950s. So in a way, it is hard to appreciate the book because of that --- but it is well worth reading anyway. Who can resist an author who writes lines like, "It is curious that both human beings and this mollusc on the eastern seaboard of North America have evolved the same skyscraper prinicple for exploiting valuable ground to the full."