When I lived in Defiance, it was the first time I'd ever seen the
black squirrel. They are beautiful and unspeakably stand-offish.
They ran the native grey squirrels out of the university area and
they seemed to live quite comfortably within the artificial boundaries
they had set. I must admit they were truly beautiful and yours seem
to have inherited that same trait. I wonder how they came to be and
if they are taking over.
