Black squirrels, I believe. Saw one in Vancouver Park, Vancouver BC.
Douglas squirrels are kinda dirty dark brown on the back and red like a Robin on the belly. Quite a bit smaller than the invasive, non-native gray squirrel. Most inner city parks have only the gray, while the woods in the mountains have the Douglas.
When I see more deer, coyote and then the native squirrel in my neighborhood, I figure good things are happening in the environment.