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Factoid | 37-across: Black sheep is a common idiom used to describe a member of a group, different from the rest, especially within a family, who does not fit in. The term stems from sheep with black wool who stand out in the flock and whose wool was traditionally considered less valuable as it was not able to be dyed.
However in large herds, black sheep are used because they contrast against the landscape better than their white siblings. Usually, one black sheep accompanies 100 white sheep in a flock of 1,000 or more, so that shepherds can easily count a flock.