An Eastern Grey Squirrel stands on his hind legs in a pile of dead leaves during autumn. Photograph taken in Rahway River Park in New Jersey.

Eastern grey squirrel (Sciurus carolinensis) in garden, an invasive species from North America, Henley-on-Thames, Oxfordshire, England, United Kingdom, Europe

An Eastern Grey Squirrel sits on a knot in a tree during late autumn.

Red fox (Vulpes vulpes) catching an eastern grey squirrel (Sciurus carolinensis), Montreal Botanical Garden. Quebec. Canada

Eastern grey squirrel (Sciurus carolinensis) perched on a branch and watching. A case of melanism. This squirrel is a grey squirrel with a defective pigment gene given by the fox squirrel (Sciurus niger), which makes the colour of its fur darker. Mauricie region. Quebec. Canada

Eastern Grey squirrel on a branch, Quebec Canada