Species vary between 50 & 1350 grams in weight.
Slender toes & sharp claws make them excellent climbers.
Tails are usually large & fluffy to provide shade, warmth, balance & maneuverability; also aids in climbing & slowing down falls.
Generally live 6 to 10 years in the wild.
Flying suirrels (smallest) are brownish-grey and have loose folds of skin extending from the wrists to the ankles, along with webbed feet, enabling them to glide through the air.
They have large black eyes, rounded ears, a light cream belly & a flat-looking tail.
Douglas squirrels are reddish-brown with orange eye rings & belly and black tufted ears.
Grey squirrels (largest) may be grey/brownish-grey (salt&pepper), blond, white or albino with a white/lighter grey belly, or can be completely black.
They generally have white eye rings.