Red squirrels used to be the most common squirrel in Britain. But since the grey squirrel was introduced from the USA as an illegal immigrant in the late 1800s, their numbers have nose-dived. It's not just competition for food; grey squirrels brought a deadly virus with them which has hit red squirrel populations hard. Sue Nelson goes to one of the last red squirrel strongholds in the country ... More @Wikipedia
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