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www.reference.com/article/squirrels-sleep-c40d7d574917b3f2

There are many different kinds of squirrels, but most squirrels, such as the gray squirrel, red squirrel and fox squirrel, build their dens in the sides of trees while ground squirrels typically dig dens underground. A common squirrel den will be outfitted with moss and...

www.reference.com/article/squirrels-sleep-night-19721b8a16aca72d

The majority of ground and tree squirrels are diurnal, meaning they are active during the day and sleep at night. Flying squirrels, however, tend to be nocturnal and are active at night.

www.reference.com/article/long-squirrels-live-3428286392222a6b

A squirrel can live up to 30 years, but many are eaten by predators or killed early. The squirrel's lifespan depends mainly on the type of squirrel. According to the New York College of Environmental Science and Forestry, habitat can also play a role in the squirrel's l...

www.reference.com/article/squirrels-sleep-winter-56abc18e29acb56e

Squirrels take refuge in dens and nests in the wintertime. Like humans and many other mammals, squirrels need protection from the harsh winds and elements of winter. Their wintertime shelters vary in size and composition depending on location, but all contain overhead r...

www.reference.com/article/long-squirrel-live-d65afc11b80003a4

The common eastern gray squirrel can live up to 12.5 years in the wild or 20 years in captivity. Other species have differing life spans; for instance, the southern flying squirrel lives for 5 to 6 years in the wild and up to 10 years in captivity.

www.reference.com/article/squirrels-eat-79c894ebce38dca5

Squirrels primarily eat tree nuts, seeds and fruit, but their diets can also include flowers, bark, eggs, insects, leaves and even baby birds. Squirrels are opportunistic feeders, which allows them to consume human garbage when none of their favorite foods are available...

www.reference.com/article/squirrels-live-ae21accce8a96c46

Squirrels live on every continent of the world except Antarctica and Australia. However, in recent years, squirrels have been introduced to Australia.