Researchers want the public to take part in a project to measure the UK spread of the black squirrel.
It is 100 years since the first of these appealing, but invasive, rodents was recorded in the UK.
Black and grey squirrels are the same species, so the project also aims to find out if these darker, less common squirrels carry the "grey squirrel pox" which infects the UK's red squirrels.
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BBC Nature - Search for black squirrels begins
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