Grey squirrel ( (Sciurus carolinensis), is a tree squirrel in the genus Sciurus native to the southeastern United States. An abundant and adaptable species, the gray squirrel has been introduced to, and thrives, in several regions of the United States.
The genus, Sciurus, is derived from two Greek words, skia, meaning shadow, and oura, meaning tail. This name alludes to the squirrel sitting in the shadow of its tail. The specific epithet, carolinensis, refers to the Carolinas, where the species was first recorded and where the animal is still extremely common.
As the name suggests, the gray squirrel has mostly gray fur but it can have a reddish color mixed in. It has a large bushy tail with a white underside. In many areas both white- and black-colored individuals are sometimes found. There are also genetic variations within these, including individuals with black tails and black colored squirrels with white tails. The tracks of an eastern gray squirrel are difficult to distinguish from its cousin the fox squirrel and Abert’s squirrel, though the latter’s range is entirely different from the gray’s.
like many members of the squirrel family, the gray squirrel is known as a scatter-hoarder; it hoards food in numerous small stores for later recovery. Some stores are short-term, especially those made near the site of a sudden large quantity of food which can be retrieved within hours or days for burial in a more secure site. Others are more permanent and are not retrieved until months later. It has been estimated that each squirrel makes several thousand stores each season. The squirrels have very accurate memory for the locations of these stores, and use distant and nearby landmarks to retrieve them. Smell is used once the squirrel is within a few feet of the store. It is one of very few animals that can descend a tree head-first. It does this by turning its feet so that the claws of its hind paws are backward pointing and can grip the tree bark.
Gray squirrels build a type of nest, known as a drey, in the forks of trees. The drey consists mainly of dry leaves and twigs. Squirrels may also nest in the attic or exterior walls of a house. In addition, the squirrel may inhabit a permanent tree den
Gray squirrels are more active during the early and late hours of the day, and tend to avoid the heat in the middle of the day. Gray squirrels do not hibernate.
Natural predators of the gray squirrel include humans, hawks, skunks, raccoons, domestic and feral cats, snakes, owls and dogs. On occasion, a squirrel may lose part of its tail while escaping a predator. While gray squirrels do fight among themselves over food sources, they have been known to mob potential predators such as domestic cats. They also have a complex, tag-team defensive system involving distracting would-be predators with vigorous shaking of their tails.
Gray squirrels breed twice a year, December to February and May to June, though this is slightly delayed in northern areas.] The first litter is born in February to March, the second in June to July. There are usually up to 6 young in each litter, but this number can be as high as 8. The gestation period is about 44 days. They are weaned at 7 weeks and leave the nest after 10 weeks.
Gray squirrels can start breeding as early as 5 and a half months old, but usually breed for the first time at a year old. They have lived to be 20 years old in captivity, but in the wild it usually only lives to a maximum of 12 years old.
Like most other mammals, communication among eastern gray squirrel individuals involves both vocal and posture. They have various vocalizations, including a squeak similar to that of a mouse, a low pitched noise, a chatter. Other methods of communication include tail-flicking.
Gray squirrels eat many types of seeds, acorns, walnuts, and other nuts, and some types of fungi found in the forests.
They have a high tolerance for humans and inhabit residential neighborhoods they will raid bird feeders for corn, and sunflower seeds.
In the wild, eastern gray squirrels can be found large mature, dense wooded areas that generally cover 40 acres of land and up. These forests usually contain dense vegetation that provides food sources and cover. Gray squirrels generally prefer constructing their dens in a large tree and within the hollow trees. They also have been known to take over abandoned bird nests. In human populated areas gray squirrels are found in parks and backyards of houses and in the farmlands of rural environments.