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Gray squirrels (Sciurus carolinensis) are small rodents native and common to the United States’ eastern and midwestern regions, and found in other regions and countries through non-native introduction. Male squirrels are called “boars” and female squirrels are referred to as “sows.” From a distance, it can be difficult to tell them apart, but close observation of physical characteristics and behaviors -- especially those associated with reproduction -- can reveal a squirrel’s sex.

Appearance

Often, a mammal’s sex can be determined by its size, fur coloration or other physical attribute. Gray squirrels, however, are not so easily distinguished by these characteristics. Male and female gray squirrels both weigh 1 to 1 1/2 pounds at maturity and measure about 18 inches in length. About half of their length comes from their large, bushy tails that also do not vary in appearance between sexes. These similarities make sexing gray squirrels from a distance -- such as in the backyard -- difficult or impossible.

Reproductive Organs

When much closer to a gray squirrel -- such as in a veterinary examination -- the sex of the animal can be determined by viewing its reproductive organs. Like most mammals, male gray squirrels have a outwardly visible penis and scrotum, while females have a visible vaginal area. During mating season, a gray squirrel’s testes are swollen and the scrotum is fully descended. This is one of the only times a typical backyard observer may be able to determine a squirrel’s sex, though close range is still needed.

Mating

A gray squirrel’s sex can also be determined by observing mating chases that occur in mid-summer and late winter. When females are in estrus, meaning they are ready to mate, they attract males with their scent. One or more males will vigorously chase the female for a mating opportunity. It's generally clear in the mating chase which squirrel is the receptive female and which are the attracted males, confirmed if the mating ritual is observed. The hierarchy of male squirrels can also be observed, as the dominant male is typically the one that will mate with the female.

Parenting

Parenting behaviors also help indicate male and female squirrels. Females bear and raise their young in dens and keep to a very small territory while with their young. At about 6 weeks old, the young start to leave the den, but remain close to their mothers for at least several more weeks. When observing an adult squirrel with juveniles, the adult is typically female and their mother. Male and female squirrels do not form pair bonds, so the male is not typically seen with its young or in the female’s den. Banished mods black liquid.

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Author

E. Anne Hunter has more than a decade of experience in education, with a focus on visual design and instructional technology. She holds a master's degree in education. Hunter has contributed to several professional publications, covering education, design, music and fitness, among other topics.

Gray squirrels use leaf nests, also known as “dreys,” primarily during the summer months. They build these nests up to 30 feet off the ground in the fork between a tree limb and the tree’s main trunk, well hidden by the summer foliage. The single entrance is concealed, facing the trunk of the tree.

These nests are typically intended for one squirrel, but occasionally two Eastern gray squirrels will sleep together in the same leaf nest if the temperature drops. Squirrels use these nests as temporary shelters, and most adults have more than one in case of insect infestation. Squirrels also nest in more stable and protected dens in hollow tree trunks. Tree dens are used year-round, but are particularly necessary in winter. An adult typically has at least two different tree dens within its home range. While a female Eastern gray squirrel who mated in the summer may return to the tree den where her winter litter was born, it’s more typical for her to find a new location for each litter. The ring of truth atoms.

Litters born in tree dens are much more likely to survive than those born in leaf nests.