Giant hogweed is another case, spreading along stream sides for many miles.
Is it worth saying that he considers the ecological case against hogweed to be overblown, and quotes James Dickson, formerly of Glasgow Uni as saying that it supports a spring flora, with smaller plants growing beneath it?
the lovely native red squirrel
Once widely regarded as a pest, the Scottish Highland Squirrel Club being founded to exterminate the 'devastating menace'.
the greys carry a virus I think it is that harms the reds
A quick net search suggests that the current thinking is that the greys are just better fitted: larger and more adaptable.
The book is at least thought-provoking.