Our countryside is filled with grey squirrels and parakeets, snowdrops and pheasants, rhododendrons and rabbits, none of which are indigenous to Britain. The pace of invasion is now higher than ever before. But, non-natives, problematic or peaceful, aren’t a modern phenomenon: they’ve always been with us. From the earliest settlement of our islands and the first experiments with farming, through the Roman and medieval times, to the age of exploration by Europeans and the current period of glo... See more >