Yes - I have 11 grey squirrels and 2 flying squirrels. I love them so! Right now I also have 7 baby squirrels that I am feeding and hope to release in a few months! ;o)
I had a flying squirrel once; Peppy! He fell out of a tree as a tiny baby and I raised him. He loved corn on the cob and green beans! He'd sit on the table and munch his food while we ate. I had him 5 years before he died--an accident. I miss him:-(. I've never been able to find another.