When first observed through the window at home in a tree I assumed this was some unseen before grooming being done by 3 different squirrels. 2 Grey and 1 Black squirrels were doing what I thought was grooming for about 20 minutes. Black Squirrels have been seen in the yard here for very many years. When looking at the images I realized these squirrels had parasites of some sort, tick, mites, fleas, etc. So this is how they care for each other out in the wild to try to remove these parasites? After awhile It was interesting to see this take place from an educational point. Feeling sorry for the squirrels, I would assume they will be fine. Images were taken on August 3, 2019.