In this part of Maryland we have not only the usual gray squirrels, but also black ones, descended from early 20th century Canadian squirrels released at the National Zoo. The photo happens to be from last summer, when the butterfly bushes were in bloom, but apart from the flowers it could have been taken today. The black color is considered to be a variation of the gray rather than a separate species.
There are two of them (at least), very aggressive in their pursuit of sunflower seeds. This puts them in competition with the birds, including the house finches, also not native to this area, but very much at home now.