Do you know why red squirrels are the only type of squirrel in an area once they move in? Your animation made me remember the interesting answer. Despite their small size, they won’t tolerate other species of squirrels in their territory. To get rid of the other squirrels, reds will attack the male of the other species and bite off his jewels thereby rendering him incapable of reproducing!
It must be the same with black squirrels.
Right down the block from me .. all I ever see are black squirrels.
I never knew there were such things as black squirrels until I saw them down the street!