Eastern gray squirrel
Sciurus carolinensis
Mammal
Tree squirrel of eastern North American hardwood forests that feeds on the nuts and mast of oaks, hickories, walnut, pecan, and beech. It scatter-hoards surplus nuts in shallow single-seed caches each autumn and recovers them by memory and smell; the substantial fraction never recovered germinates, making the squirrel an effective disperser that aids regeneration of oak and other heavy-seeded trees. It nests in tree cavities and builds leaf-and-twig dreys high in the canopy, so mature nut-bearing trees supply both its food and its shelter.
Conservation
IUCN Red List: Least Concern; abundant and secure across its native range and not federally listed. Native populations are stable; the species is, however, an invasive that displaces native red squirrels where it has been introduced in Europe.
Plan for this species
Location-fit plant set for Chicago, IL: host and specialist plants first, then nectar, fruit, seed, foliage, and shelter plants that still fit the current and mid-century climate read.
0 essential relationships / 6 supporting plants
Host/specialist links: 0
Forage/pollination links: 6
Shelter links: 0
Relationship roles: 2
Pagoda dogwood
Supporting / Fruit plants
The Wildflower Center names squirrels among the mammals taking the fruit. Wikipedia adds black bear, which has no entry in this catalog. Squirrels are a mixed blessing on this plant - they take fruit before it is fully ripe and they strip bark on young stems, and bark wounds are an entry point for the borers and cankers that cut this plant short.
Mapleleaf viburnum
Supporting / Fruit plants
Wikipedia records the berries being eaten by skunks, rabbits, deer, eastern chipmunks, white-footed mice and deer mice - a small-mammal list rather than a bird list, which fits a shrub that fruits within reach of the ground. None of those species has an entry in this wildlife catalog, so they are named here in prose and the relationship is wired to the gray squirrel as the catalogued small mammal with the same habits, marked plausible because no cited source names it.
Nannyberry
Supporting / Fruit plants
The Wildflower Center explicitly includes mammals among the winter fruit eaters without naming them. Grey squirrels are the most likely mammal to work a fruiting shrub of this height across the eastern part of the range, so the entry sits at plausible pending a species-level source.
Silky dogwood
Supporting / Fruit plants
Wikipedia names rodents among the animals that eat the fruit and disperse the seed. Grey squirrels are the likely eastern candidate in a garden setting, but the source says rodents rather than naming a species, so this is recorded as plausible.
American chestnut
Supporting / Seed plants
Chestnut mast was historically a dietary staple for the eastern gray squirrel, which both ate and cached the nuts; the loss of the American chestnut removed one of the most reliable, abundant fall mast crops of the eastern forest. On the rare bearing tree today squirrels still take the nuts readily.
Black oak
Supporting / Seed plants
Squirrels take and cache the acorns heavily. Black oak bears well only every 2 to 3 years, so a mast year is a local event that drives squirrel numbers into the following season.
Plants in the catalog
Fruit plants · 4
Wikipedia records the berries being eaten by skunks, rabbits, deer, eastern chipmunks, white-footed mice and deer mice - a small-mammal list rather than a bird list, which fits a shrub that fruits within reach of the ground. None of those species has an entry in this wildlife catalog, so they are named here in prose and the relationship is wired to the gray squirrel as the catalogued small mammal with the same habits, marked plausible because no cited source names it.
The Wildflower Center explicitly includes mammals among the winter fruit eaters without naming them. Grey squirrels are the most likely mammal to work a fruiting shrub of this height across the eastern part of the range, so the entry sits at plausible pending a species-level source.
The Wildflower Center names squirrels among the mammals taking the fruit. Wikipedia adds black bear, which has no entry in this catalog. Squirrels are a mixed blessing on this plant - they take fruit before it is fully ripe and they strip bark on young stems, and bark wounds are an entry point for the borers and cankers that cut this plant short.
Wikipedia names rodents among the animals that eat the fruit and disperse the seed. Grey squirrels are the likely eastern candidate in a garden setting, but the source says rodents rather than naming a species, so this is recorded as plausible.
Seed plants · 29
Chestnut mast was historically a dietary staple for the eastern gray squirrel, which both ate and cached the nuts; the loss of the American chestnut removed one of the most reliable, abundant fall mast crops of the eastern forest. On the rare bearing tree today squirrels still take the nuts readily.
Squirrels take and cache the acorns heavily. Black oak bears well only every 2 to 3 years, so a mast year is a local event that drives squirrel numbers into the following season.
Squirrels take the samaras heavily. Because the seed persists on female trees well into winter rather than dropping in autumn, boxelder fills a genuine gap in the seed calendar when most other sources are exhausted.
The large acorns are prime squirrel food, but white-oak acorns germinate immediately on falling, so squirrels tend to eat them rather than cache them - which makes chestnut oak a food source more than a dispersal partnership.
Squirrels take the small sweet acorns readily. As with other white-group oaks the acorns germinate on falling, so they are eaten rather than cached, and dispersal depends more on jays carrying them off before they sprout.
Squirrels crack and eat the ripening nuts (NC State); the grey squirrel is now the dominant nut predator of hazel across much of Britain. Dormice, wood mice, nuthatches, tits and jays take the nuts too (Woodland Trust).
Squirrels readily gnaw open and cache fallen walnuts where the tree is planted; English walnut is a Eurasian species rather than part of the native eastern food web, so this is a plausible foraging tie on a cultivated tree rather than a documented native-fauna relationship.
Squirrels cut and strip green cones for the seed, leaving the shredded cone cores that litter the ground under a productive tree.
The large, nutritious pine seeds from the fall cones are eaten by squirrels and other small mammals, which cache and disperse them.
Squirrels and other mammals gnaw open and cache the hard pignuts, dispersing the seed in the process.
The eastern gray squirrel both eats and caches acorns; the small, abundant pin oak acorns are a reliable fall-and-winter food and the squirrel's caching helps disperse the species.
Squirrels take the small sweet acorns readily. As with the other white oaks the acorns germinate on falling and so are eaten rather than stored, which makes the tree a food source more than a caching partner.
NC State Extension and the Lady Bird Johnson Wildflower Center both record squirrels eating the seeds; the buckeyes are toxic to people and most wildlife, but gray squirrels are documented consumers of them.
Scarlet oak acorns are gathered and cached by eastern gray squirrels and other small mammals; the 2-year acorn cycle drives mast years that feed the wider food web.
Squirrels harvest and cache the acorns; as with all oaks, this both feeds the squirrels and disperses the acorns that escape being eaten.
The samaras are unusually large and ripen in late spring rather than autumn, filling a genuine gap in the seed calendar; squirrels take them heavily, as do finches and grosbeaks.
Range
Native across the eastern United States to just west of the Mississippi River and north into southeastern Canada.
Sources & citations
Cite this page
Use this citation for the Plotwright wildlife record. Use the source cards below to explore the references that informed its taxonomy, range, conservation, host plants, foraging, and habitat.
Plotwright. (n.d.). Eastern gray squirrel (Sciurus carolinensis). Retrieved 2026, August 20, from https://plotwright.com/wildlife/eastern-gray-squirrel
Sources used for this record
This record is compiled from the sources below.
Animal Diversity Web: Sciurus carolinensis
Natural-history account for identity, range, tree-den and leaf-drey nesting, mast/fruit/fungi diet, scatter-hoarding, seed dispersal, and Least Concern status.
GBIF: Sciurus carolinensis
GBIF backbone record confirming the accepted species name and aggregating occurrence data across its native and introduced range.
iNaturalist: Eastern Gray Squirrel
iNaturalist taxon page corroborating the accepted name and mapping verified community observations across its range.
Eastern gray squirrel - Wikipedia
Encyclopedia overview covering identification, native and introduced range, and scatter-hoarding and reproductive life-cycle details.