What is the issue of red and grey squirrels?
From my experience I have found that the red squirrel is more aggressive and will drive gray squirrels out of an area. They are smaller in size and are more timid than the gray squirrels. The red squirrel will live in hollows of trees and even in people’s attics. Gray squirrels will make a nest either in a tree hollow or in the branches of a tree. I hope this helps.