Despite the difference in appearance, how are black and gray Eastern Gray Squirrels classified biologically?

Answer

They are the same species, Sciurus carolinensis

Black and gray squirrels are simply different color morphs of the identical species, sharing the same behavior, diet, nesting habits, and life cycles.

Despite the difference in appearance, how are black and gray Eastern Gray Squirrels classified biologically?
colorvariationsquirrelMelanismeastern gray squirrel