Eastern Grey Squirrel Male Vs Female. Europe's grey squirrels (sciurus carolinensis) originated in north america, where they are known as eastern gray squirrels (to differentiate from western gray squirrels). Sometimes called the eastern grey squirrel, sciurus carolinensis is one of the most common tree squirrels throughout its natural range.
Our common urban squirrels are eastern grey squirrels.
Eastern grey squirrels sciurus carolinensis commonly occur in two colour phases, grey and black, which leads people to think—mistakenly—that there the eastern grey squirrel is a tolerant species and exhibits little aggressive behaviour. Squirrel on wooden crossbar, closeup. Eastern grey squirrels sciurus carolinensis commonly occur in two colour phases, grey and black, which leads people to think—mistakenly—that there the eastern grey squirrel is a tolerant species and exhibits little aggressive behaviour. It is a medium sized squirrel with no size difference between males and females.