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The western gray squirrel (Sciurus griseus) is a tree squirrel found along the western coast of the United States and Mexico. In some places, this species has also been known as the silver-gray squirrel, the California gray squirrel, the Oregon gray squirrel, the Columbian gray squirrel and the banner-tail.
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.
The California ground squirrel (Otospermophilus beecheyi), also known as the Beechey ground squirrel, [4] is a common and easily observed ground squirrel of the western United States and the Baja California Peninsula; it is common in Oregon and California and its range has relatively recently extended into Washington and northwestern Nevada.
A UC Davis study found a population of Bay Area ground squirrels hunting and eating voles, suggesting the species may be more flexible in its diet than previously thought.
The majority of the eastern gray squirrels in Calgary originated as pets, or zoo animals that escaped captivity during the 1930s. As in Ontario, black eastern gray squirrels are now the predominant morph of the species found in Calgary. [35] The black morph population in Marysville, Kansas were supposedly released into the area by accident. [36]
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The study is part of a larger investigation into the behavioral ecology of California ground squirrels spanning a 1000 square meter area in Briones Regional Park in Contra Costa County, California.
The southern fox squirrel can vary in length from 20–26 inches (51–66 cm) and they can weigh from 1.5–2.6 pounds (0.68–1.18 kg). [3] They are about double the size of the much more common eastern gray squirrel. [4]