Squirrels are small, energetic animals that people see in parks, backyards, and forests all around the world. They belong to the rodent family Sciuridae, which also includes chipmunks, marmots, and prairie dogs. While many people only think of the common gray squirrel that runs across fences or climbs trees, there are actually more than 200 different species of squirrels spread across various habitats. Each type of squirrel has its own diet, behaviors, and adaptations.
This guide explores the main types of squirrels and what they eat. By the end, you’ll see how diverse these animals really are and how their diets play a role in their survival. From my own personal experience observing squirrels, I’ve noticed how quickly they adapt to food sources depending on where they live, which shows just how resourceful these animals are.
Let’s Understand Squirrel Groups
Before diving into the diets of individual squirrel types, it’s important to understand that squirrels are generally divided into three main groups:
- Tree squirrels – These live in trees, build nests from leaves, and are commonly seen in parks and neighborhoods.
- Ground squirrels – These live in burrows and spend a lot of time foraging on the ground.
- Flying squirrels – These can glide between trees using a skin membrane stretched between their limbs.
Each group includes many species, and each species has a diet shaped by its environment.
Tree Squirrels and Their Diets
Tree squirrels are probably the most familiar to you. They’re agile climbers, able to leap across branches with ease. They tend to live in wooded areas but have also adapted to urban and suburban settings.
Eastern Gray Squirrel
The Eastern Gray Squirrel is one of the most widespread in North America. Its fur ranges from gray to brown, and it has a bushy tail.
Diet:
Eastern Grays eat a wide range of foods including acorns, hickory nuts, walnuts, seeds, and fruits. They also raid bird feeders for sunflower seeds and corn. In urban areas, they adapt by eating discarded food scraps. Their ability to bury nuts for later use is one of their most recognizable habits.
Fox Squirrel
The Fox Squirrel is the largest tree squirrel in North America. Its fur often has reddish-brown tones.
Diet:
Fox Squirrels feed heavily on nuts like acorns and walnuts, but they also consume fruits, buds, fungi, and insects. They are more willing than other squirrels to forage on the ground for extended periods.
Red Squirrel
Red Squirrels are smaller and highly territorial. They’re known for their reddish fur and loud, chattering calls.
Diet:
Unlike gray squirrels, Red Squirrels prefer coniferous forests and rely heavily on pine cones. They store cones in large piles called middens. They also eat seeds, berries, and mushrooms.
Western Gray Squirrel
Native to the western United States, the Western Gray Squirrel has silver-gray fur and a long bushy tail.
Diet:
Its diet includes acorns, pine nuts, and truffles. They are particularly important in spreading fungi spores through their droppings, which supports healthy forest growth.
Japanese Squirrel
This species is found only in Japan’s Honshu Island forests.
Diet:
Japanese Squirrels eat acorns, walnuts, and seeds. They also include bark, buds, and occasionally insects in their diet. Seasonal changes strongly affect their food choices.
Ground Squirrels and Their Diets
Ground squirrels live in burrows and are more likely to be found in open fields, grasslands, and rocky areas. They’re excellent diggers and often hibernate during winter.
California Ground Squirrel
The California Ground Squirrel is common across the western U.S. and is known for its gray-brown mottled fur.
Diet:
Its diet includes seeds, grains, and nuts, but it also eats insects, caterpillars, and small vertebrates. They can become agricultural pests when they invade crop fields.
Richardson’s Ground Squirrel
This squirrel lives in the northern plains of the U.S. and Canada.
Diet:
Richardson’s Ground Squirrels feed mostly on grasses, seeds, and grains. During late summer, they bulk up on high-energy foods before hibernation.
Arctic Ground Squirrel
Found in Alaska and northern Canada, Arctic Ground Squirrels survive in some of the harshest conditions.
Diet:
They eat grasses, roots, seeds, and insects during the short summer season. They must consume enough energy to survive their long winter hibernation, which can last up to eight months.
Rock Squirrel
Native to Mexico and the southwestern U.S., Rock Squirrels resemble small prairie dogs.
Diet:
They eat seeds, nuts, cactus fruits, and occasionally small animals. Their burrows are often located near rocky outcrops.
Cape Ground Squirrel
These squirrels are native to southern Africa. They have less bushy tails compared to tree squirrels.
Diet:
Cape Ground Squirrels feed mainly on seeds, roots, and bulbs. They also eat insects when available. Their diets reflect the dry, open environments they inhabit.
Flying Squirrels and Their Diets
Flying squirrels are fascinating because of their ability to glide through the air. They use a skin flap called the patagium to travel from tree to tree. They are nocturnal, which makes them harder to spot.
Southern Flying Squirrel
The Southern Flying Squirrel is the most common flying squirrel in North America.
Diet:
It eats nuts, seeds, fruits, fungi, and insects. They’re also known to feed on bird eggs and nestlings when food is scarce.
Northern Flying Squirrel
This species lives in colder northern regions and prefers coniferous forests.
Diet:
Northern Flying Squirrels feed largely on fungi, especially truffles, along with seeds, berries, and lichens.
Siberian Flying Squirrel
Found across northern Europe and Asia, the Siberian Flying Squirrel is rare and considered near-threatened.
Diet:
Its diet includes catkins, buds, seeds, and leaves. In summer, it adds berries and insects for variety.
Indian Giant Flying Squirrel
This large flying squirrel has a reddish-brown coat and is found in South Asia.
Diet:
It eats fruits, flowers, bark, and leaves. Its diet is more plant-heavy compared to other flying squirrels.
Red Giant Flying Squirrel
Another large species, native to Southeast Asia, with bright reddish fur.
Diet:
It consumes fruits, nuts, leaves, and shoots. Its gliding ability helps it reach food sources across wide forest gaps.
How Diets Reflect Adaptation
The diet of each squirrel species reveals how they adapt to their environment:
- Tree squirrels depend on nuts and seeds but adjust to fruits, fungi, and urban food sources.
- Ground squirrels rely on grasses, grains, and roots, with added protein from insects.
- Flying squirrels have diverse diets that include fungi, fruits, and even animal matter.
This adaptability is what allows squirrels to survive in forests, deserts, tundras, and cities.
Seasonal Diet Changes
Squirrel diets change dramatically with the seasons.
Spring
In spring, squirrels eat buds, flowers, and young shoots. Food is fresh and abundant.
Summer
Summer diets include berries, seeds, and insects. This is when squirrels gain weight for winter.
Autumn
Fall is the busiest season. Squirrels gather and bury nuts, a behavior known as caching. These stores sustain them through winter.
Winter
In cold months, squirrels rely on cached food, bark, and fungi. Ground squirrels hibernate, while tree squirrels reduce activity to conserve energy.
Why Squirrels Are Important
Squirrels may look like ordinary backyard animals, but they play key roles in ecosystems. By burying nuts and forgetting some of them, they help forests regenerate. Their diets also spread fungi spores that support healthy soil.
Based on my overall experience observing different species, I’ve noticed how squirrels are a perfect example of balance in nature. Their diets not only keep them alive but also support entire ecosystems.
Final Thoughts
Squirrels are far more diverse than most people realize. From Eastern Gray Squirrels raiding bird feeders to Arctic Ground Squirrels storing up fat for freezing winters, every species has unique habits and diets. The variety in their food choices shows how adaptable they are. Whether they live in trees, burrows, or glide through forests, squirrels are a vital part of nature’s cycle.
Understanding the types of squirrels and their diets gives you a deeper appreciation of these lively creatures. Next time you see one darting across a branch or digging in your yard, you’ll know that its behavior is part of a bigger survival story.