[Darksheare]

We have three.
Timid red squirrels, but they tend to spook easily, the agile but territorial grey, and the black furred squirrels.
The last ones mentioned are almost suicidal in their aggression, leaping at large dogs in their attempts to drive off ‘the invader’.
I learned to avoid their nesting spots, and look up while running whenever I hear ‘Chree chree chreeee!’
Immediately after the call, stuff will rain down on you.

Even the greys won’t tangle with ‘em.

But they will cavort around feeders, just as the others do.
Just, one doesn’t want to be the center of a squirrel attack.

[Kitty Mittens]

I Wanted to Go and Hunt Up a Pic of a Black Squirrel on the 'Net after your Description of them, and they are Very Cute! Lol, they Look So Innocent; I'd have Never Known they are Aggressive by their Appearance. They would Probably Try to Run Off my Rather Docile Squirrels!

[GodBlessUSA]

They are characters. I think if you push them they will retaliate. They are so cute and playful in my yard. I had a neighbor who would throw things at them. She didn’t like them. She would tell me when she swept her walkway they would throw acorns at her. LOL!!