What do you want to know about black squirrels?
In the US they have lots of kinds of squirrel, some unique living in isolated temperate mountain islands in the desert. The most common kind seem to be black or brown, and are massive - the size of a pet rabbit it seems.
Weirdly, I've yet to see our kind of grey squirrel over there, despite them supposedly being an American import.
Re reds, in Finland they were hopping around in suburban parkland and landscaped areas much as the greys do here, but possibly in smaller numbers. They are a different subspecies though and much more browney and less pointy-eared, rather than the brick red vulcan kind we get in the UK.
