The eastern gray squirrel, also known, particularly outside of North America, as simply the grey squirrel, is a tree squirrel in the genus Sciurus. It is native to eastern North America, where it is the most prodigious and ecologically essential natural forest regenerator. Widely introduced to certain places around the world, the eastern gray squirrel in Europe, in particular, is regarded as an invasive species.
Eastern gray squirrel
A brown morph of the gray squirrel in Union Square, NYC.
Bounding tracks in concrete
Leucistic eastern gray squirrel
Tree squirrels are the members of the squirrel family (Sciuridae) commonly just referred to as "squirrels". They include more than 100 arboreal species native to all continents except Antarctica and Oceania.
Eastern gray squirrel (Sciurus carolinensis)
Prevost's squirrel (Callosciurus prevostii)
Indian palm squirrel (Funambulus palmarum)
American red squirrel (Tamiasciurus hudsonicus)