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Juvenile grey squirrels – one black, one with normal colouration – from two different litters. Among eastern squirrels, gray mating pairs cannot produce black offspring. Gray squirrels have two copies of a gray pigment gene and black squirrels have either one or two copies of a black pigment gene.
[11] [12] Squirrels typically have slender bodies with very long very bushy tails and large eyes. In general, their fur is soft and silky, though much thicker in some species than others. The coat color of squirrels is highly variable between—and often even within—species. [13]
The fox squirrel (Sciurus niger), also known as the eastern fox squirrel or Bryant's fox squirrel, [3] is the largest species of tree squirrel native to North America.It is sometimes mistaken for the American red squirrel or eastern gray squirrel in areas where the species co-exist, though they differ in size and coloration.
Eastern gray squirrels are crepuscular, [24] or more active during the early and late hours of the day, and tend to avoid the heat in the middle of a summer day. [40] They do not hibernate. [41] Eastern gray squirrels can breed twice a year, but younger and less experienced mothers normally have a single litter per year in the spring.
Abert's squirrels vary in color across their range. Most populations have a gray coat with a reddish stripe down the back, a dark stripe along the side, and a white underbelly. Some populations lack the reddish back stripe, instead having fully gray upperparts. A fully black color morph is present in the foothills of the Rocky Mountains in ...
The two outer stripes run from the forelegs to the hind legs only. It has a creamy-white belly and a tail covered with interspersed, long, black and white hair. The ears are small and triangular. Juvenile squirrels have significantly lighter coloration, which gets progressively darker as they age. Albinism is rare, but exists in this species.
Southern flying squirrels have grey-brown fur on top with darker flanks and are a cream color underneath. They have large dark eyes and flattened tails. They have a furry membrane called a patagium that extends between the front and rear legs and is used to glide through the air. Total length (including tail) is 21–26 cm (8.3–10.2 in).
In comparison to other fox squirrels, this subspecies is large (23 - 28 in. = 600 – 700 mm) with highly variable dorsal fur color ranging from nearly all black (uncommon) to silver, with variations of black over silver and silver over black. The underside is tan, while the head is generally black; the ears and muzzle are often white.