The first wild black squirrel was spotted in 1912 outside Letchworth in Hertfordshire after being introduced to the area by a Victorian aristocrat.
The darker animals are the same species as the invasive greys and have slowly been increasing as they interbreed with the larger resident population.
At the moment it is estimated there could be as many as 25,000 in the east of England.
Meanwhile native red squirrel populations have crashed in the last 100 years because of the greys spreading disease and taking over habitat.
It is thought there could be less than 30,000 left in the north of England and the islands around the south coast, where the population has held out.
Source: Black squirrels could outnumber reds in England - Telegraph
So the greys will soon be victims also
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