We have grey squirrels everywhere, they cross the streets, inhabit our trees, under our porches, and even under our roofs. The little red squirrels are more difficult to see. They live up in the trees and rarely come down to harvest nuts. People say they are aggressive and do not hesitate to chase the much larger grey squirrels.
A super capture, we have both in the north east of the UK but not as close to homes! The red ones are protected and only live in certain areas. The grey ones are found in parks and woody areas not near homes or at least not near ours!
Ian