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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.
They do not form a single natural, or monophyletic, group; they are variously related to others in the squirrel family, including ground squirrels, flying squirrels, marmots, and chipmunks. The defining characteristic used to determine which species of Sciuridae are tree squirrels is dependent on their habitat rather than their physiology .
Tree squirrels undergo a complete head-to-tail molt in the spring and a rump-to-head molt in the fall. Tail hair is replaced only in the spring. Nesting mothers will use their tail hair to line birthing nests. Western gray squirrels eat berries, nuts, a variety of seeds, and the eggs of small birds.
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Individual seeds. M. grandiflora can produce seed by 10 years of age, although peak seed production is achieved closer to 25 years of age. Around 50% of seeds can germinate, and they are spread by birds and mammals. [9] Squirrels, possums, quail, and turkey are known to eat the seeds. [20]
Squirrels eat a variety of nuts, berries, fruit, conifer tree cones, greens, and fungi. ©Dmitry Potashkin/iStock via Getty Images Squirrels are masters at storage and also deception.
Squirrels are what's known as opportunistic feeders, meaning that they'll chow down on human food if given the opportunity. Depending on the time of year, squirrels also eat tender leaf buds, wild ...
Squirrels, being primarily herbivores, eat a wide variety of plants, as well as nuts, seeds, conifer cones, fruits, fungi, and green vegetation. Some squirrels, however, also consume meat, especially when faced with hunger. [21] [32] Squirrels have been known to eat small birds, young snakes, and smaller rodents, as well as bird eggs and insects.