CAMBRIDGE, England, Jan. 30 (UPI) -- British researchers are asking the public for help in determining the extent of invasive black squirrels in the country, first seen 100 years ago.
Black and the more common gray squirrels are the same species, and scientists from Anglia Ruskin University say they want to find if the darker, less common squirrels carry the "gray squirrel pox" disease that can infect Britain's native red squirrels.