Apparantly, in 1889 the grey squirrel was an endangered species in Washington DC, due to overhunting. They began a rehabilitation/breed/release program in the city, which has clearly done well. However, since the current population started from such a small population, the genepool is thickly filled with dark-fur genotypes. Hence, these normally rare black-colored Grey Squirrels, are in relative abundance in DC. Cute!