When Where Eastern Grey Squirrel Introduced

Eastern Grey Squirrel

The scientific name for the Eastern Grey Squirrel is Sciurus carolinensis. Emily K. Gonzales analyzed the distribution of this species in British Columbia. In this article, she highlights the different aspects of their biology, including their diet and courtship behaviour. She also discusses their genetic patterns. Once you understand these basics, you can go on to learn about the different ways they are able to survive in new areas.


The eastern gray squirrel’s range extends across the eastern United States. The species is a diurnal rodent, with peak activity times in the early morning and late afternoon. Males are sexually mature at one to two years old, and females are fertile between two and three years old. In North Carolina, reproductive longevity is estimated to be over eight years. In captivity, the eastern gray squirrel lives up to 20 years, although their life expectancy in the wild is significantly shorter. The animals are prone to predation and their habitat presents challenges.


The eastern gray squirrel is a species of rodent in the genus Sciurus. Its name comes from the Greek words skia and oura, meaning “squirrel sitting in the shadow of its tail.” Eastern grey squirrels are diurnal, meaning they spend most of their day in darkness. The eyes of gray squirrels are adapted for high levels of light. They also have superior visual acuity. Because they have a broad vision range, the gray squirrel has a “blind spot” located in its lower visual field. This allows the animal to see a wide range of things in a single day, including objects in the dark.

Courtship behaviour

The eastern grey squirrel has a long history of courtship. The process of courtship begins in the fall, and reaches its peak in January when hormone levels are high. Male grey squirrels are attracted to females during the courtship phase, and the first male they encounter usually rejects the female. Multiple males may chase after a single female, jostling for the prime position. During this period, the female is often seen lifting her tail, and the male will retreat.

Genetic patterns

Recent research has demonstrated genetic variations in the cognitive abilities of the eastern gray squirrel. These genetic differences may be adaptive in nature, as these mammals exhibit enhanced cognitive abilities in response to novel environments. For example, gray squirrels in urban settings tend to perform better than those in rural areas. However, these genetic differences do not necessarily indicate that grey squirrels are superior. Their cognitive abilities have likely undergone slight variations during their evolutionary history. In addition to being beneficial, these differences may also be indicative of species-level adaptations to new environments.

Habitat selection

There are numerous factors that influence the habitat selection of Eastern Grey Squirrels. In the Lower Mainland, residential development has increased the number of suitable habitats. The area is well-forested with many deciduous trees. Human habitats such as gardens and bird feeders provide abundant food and a place to nest. Ultimately, this helps to ensure the continued existence of these animals. But, how do we ensure the best habitat selection for these animals?

Threat to native species

The threat to native species from Eastern gray squirrels is real. While the species is native to North America, it has been introduced into cities and suburbs to thrive in the city’s parks and gardens. They also damage electrical wires and shingles, and can tear down trees and vines. Fortunately, this species isn’t as widespread as some may think. In fact, it’s only found in the parts of eastern Canada where the boreal forest doesn’t exist.


Studies of the fates of eastern grey squirrels have suggested that the telemetry study can be an effective means to detect disease. Among the translocated squirrels, 29 survived the experiment; one of them homed 5.2 kilometers in 24 days. Despite the radiotransmitters, two squirrels died. Of the seven transmitters found, three signaled death, and three were not detected at all. Although the fates of translocated and control squirrels did not differ by x21, the proximal causes of death were most likely injury and starvation.

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