Against the Grey (2018)

Red squirrels are facing extinction in the UK because of a disease that is given to them by grey squirrels. Over the years, people have been trapping and shooting grey squirrels as a means to prevent red squirrels from contracting this disease. However, this has been somewhat controversial, as the grey squirrels aren't intentionally harming red squirrels. But what if there was another way, a way that could save red squirrels without resulting in the death of grey squirrels?