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Grey mating pairs can not produce black offspring. Grey squirrels have 2 copies of a normal pigment gene and black squirrels have either 1 or 2 copies of a mutant pigment gene. If a black squirrel has 2 copies of the mutant gene it will be jet black. If it has 1 copy of a mutant gene and 1 normal gene it will be brown-black. In areas with high concentrations of black squirrels, mixed litters are common.
They are common in the Midwestern United States, Ontario, Quebec, parts of the Northeastern United States and Britain.
This squirrel was just outside the entrance of a school in bushes. He allowed me to get within 6ft of him. After about one minute he ran up a nearby tree.