While walking through forests or mountains in Korea, you may occasionally spot a grayish animal quickly climbing a tree trunk or jumping between branches. This is the animal known in Korea as the Cheongseolmo, or Eurasian red squirrel.
The Eurasian red squirrel is one of the familiar wild rodents found in Korea. It is highly adapted to life in trees and uses its long, bushy tail to maintain balance while moving quickly between branches.
It particularly enjoys nuts and seeds such as acorns, walnuts, and pine seeds. It may also store food underground or around trees for later use.
In this article, we’ll explore the Eurasian red squirrel’s characteristics, appearance, habitat, diet, behavior, reproduction, and ecological importance.
What Is the Eurasian Red Squirrel?
The Eurasian red squirrel is a tree-dwelling rodent belonging to the squirrel family.
The animal commonly called Cheongseolmo in Korea is generally classified as the Eurasian red squirrel, with the scientific name Sciurus vulgaris.
Although the Korean name contains a character that can suggest a blue or greenish color, the animal itself is not blue. Individuals found in Korea often have gray, grayish-brown, or dark brown coats.
Basic information includes:
- Korean name: Cheongseolmo
- English name: Eurasian Red Squirrel
- Scientific name: Sciurus vulgaris
- Order: Rodentia
- Family: Sciuridae
- Habitat: Forests, coniferous forests, mixed forests, and parks
- Diet: Seeds, nuts, fruits, shoots, and fungi
- Activity: Mainly during the daytime
- Notable features: Long bushy tail and excellent climbing ability
Appearance
One of the most noticeable features of the Eurasian red squirrel is its long, bushy tail.
Its body is relatively slender, with strong feet and sharp claws that are well adapted for climbing trees.
Typical physical characteristics include:
- Gray, grayish-brown, or brown fur
- Lighter-colored underside
- Large, dark eyes
- Relatively long ears
- Sharp claws
- Powerful hind legs
- Long, bushy tail
Coat color can vary considerably depending on the individual, season, and geographic region.
Size
The Eurasian red squirrel is a relatively small rodent, although it is generally larger than the striped chipmunk commonly seen in Korea.
Its body is approximately 20–25 cm long, with a tail that can be nearly as long as the body.
It generally weighs several hundred grams, although body weight varies depending on sex, season, food availability, and individual condition.
Despite its small size, it is extremely agile in trees.
Why Does It Have Such a Long Tail?
The squirrel’s tail is much more than a decorative feature.
It plays several important roles in an arboreal lifestyle.
When the squirrel runs along branches or jumps between trees, its long tail helps maintain balance.
It can also help with body control and direction while jumping and landing.
During cold weather, the squirrel may curl its tail around its body to help conserve warmth.
Tail movements may also be used as part of communication with other squirrels.
Feet and Claws
One reason Eurasian red squirrels can move so easily through trees is their strong feet and sharp claws.
The claws grip tree bark and allow the animal to support its body while climbing.
Its powerful hind legs provide the force needed to leap from one branch to another.
These physical adaptations make the squirrel extremely well suited to spending much of its time above the ground.
Habitat
Eurasian red squirrels primarily live in environments with plenty of trees.
Typical habitats include:
- Coniferous forests
- Deciduous forests
- Mixed forests
- Forest edges
- Large urban parks
- Wooded green spaces
Forests containing pine and other coniferous trees can provide particularly useful feeding areas because squirrels can eat the seeds found inside cones.
An ideal habitat provides sufficient food, shelter, and suitable trees for nesting.
Behavior
The Eurasian red squirrel is mainly a diurnal animal, meaning it is most active during the daytime.
It spends much of the day searching for food and may move between trees and the ground while foraging.
Individuals often spend considerable time alone, although several squirrels may occur within the same general area when food is abundant.
When threatened, a squirrel may quickly climb a tree or move around to the opposite side of the trunk to hide from danger.
Diet
The Eurasian red squirrel eats a wide variety of foods and can be described as primarily plant-eating but opportunistically omnivorous.
Common foods include:
- Acorns
- Pine seeds
- Walnuts
- Chestnuts
- Seeds from cones
- Other tree seeds
- Fruits and berries
- Young shoots
- Bark
- Fungi
It may occasionally consume insects or other animal matter, including bird eggs.
However, seeds and nuts make up an important part of its diet.
How Does It Eat Pine Cones?
In coniferous forests, you may find distinctive pine cones left behind by feeding squirrels.
The squirrel holds a cone with its front paws and removes the scales one by one to reach the nutritious seeds inside.
After most of the scales have been removed, the remaining central part can resemble a partially eaten corn cob.
These feeding remains can provide evidence that squirrels are living nearby.
Food-Storing Behavior
When food is abundant, Eurasian red squirrels may store food that they do not immediately eat.
Nuts and seeds can be buried underground or hidden beneath leaves and around trees.
This behavior is known as food caching.
The stored food can later be recovered when natural food becomes less abundant.
However, squirrels do not recover every seed they hide.
Some forgotten seeds may eventually germinate under suitable conditions.
Relationship with Forests
The food-caching behavior of squirrels can influence forest vegetation.
As squirrels collect and transport seeds, some are carried away from the parent tree.
Seeds that are buried but never recovered may eventually germinate and grow.
For this reason, squirrels can sometimes act as seed dispersers, contributing to the movement and regeneration of certain plants.
Front Teeth
Like other rodents, Eurasian red squirrels have well-developed incisors in the upper and lower jaws.
Rodent incisors continue growing throughout life.
As a result, squirrels need to gnaw on hard foods and other materials to keep their teeth naturally worn down.
Their strong incisors are especially useful for opening hard nuts and processing pine cones.
Nests
Eurasian red squirrels build nests in trees for resting and raising their young.
They may use materials such as:
- Twigs
- Leaves
- Dry grass
- Bark and plant fibers
They may also use tree cavities and naturally protected spaces.
Nests provide shelter from rain, wind, cold temperatures, and predators.
Reproduction
During the breeding season, males search for females, and squirrels may sometimes be seen rapidly chasing one another through the trees.
After mating, the female gives birth to her young in a nest.
Several young may be born in a single litter.
Unlike adult squirrels, newborns are poorly developed.
They are generally born with little or no fur and with their eyes closed.
They depend heavily on their mother until they grow larger and become capable of leaving the nest.
Baby Squirrels
Newborn Eurasian red squirrels cannot survive independently.
They drink their mother’s milk and remain protected in the nest during the early stages of life.
As they develop:
- Fur begins to grow
- Eyes and ears develop
- Movement becomes more coordinated
- They begin eating solid foods
- They practice climbing
- They gradually become independent
Learning to climb trees is an especially important survival skill for young squirrels.
Do Eurasian Red Squirrels Hibernate?
Eurasian red squirrels generally do not spend the entire winter in deep hibernation.
Even during winter, they may leave their nests on relatively mild days to search for food or retrieve stored food.
However, during extremely cold or severe weather, they may spend more time sheltered inside their nests.
For this reason, squirrels can still be observed in forests during winter.
Natural Predators
Eurasian red squirrels are prey for a variety of predators.
Potential predators include:
- Birds of prey
- Martens
- Weasels and related carnivores
- Leopard cats
- Foxes and other carnivorous mammals
- Some snakes
Young squirrels are particularly vulnerable.
When danger appears, squirrels often escape by rapidly climbing trees or hiding on the opposite side of a trunk.
Eurasian Red Squirrel vs. Siberian Chipmunk
In Korea, the Eurasian red squirrel is sometimes confused with the commonly seen Siberian chipmunk.
However, they have several obvious differences.
The Siberian chipmunk has distinct dark and light stripes running along its back.
The Eurasian red squirrel generally lacks these prominent stripes.
It is also larger and has a much longer, bushier tail.
Eurasian red squirrels are highly adapted to moving through trees, while chipmunks spend a considerable amount of time on the ground and frequently use underground burrows.
A simple comparison is:
Eurasian Red Squirrel
- Relatively larger
- No prominent stripes along the back
- Long, bushy tail
- Excellent tree-climbing ability
Siberian Chipmunk
- Relatively smaller
- Distinct stripes along the back
- Frequently active on the ground
- Uses underground burrows
Do Eurasian Red Squirrels Attack Humans?
Wild Eurasian red squirrels do not normally seek out humans to attack them.
When approached, they usually attempt to escape.
However, if a wild squirrel is cornered or someone tries to catch it by hand, it may bite or scratch in self-defense.
Because squirrels have sharp incisors and claws, wild individuals should not be handled unnecessarily.
Should You Feed Wild Squirrels?
When people see squirrels in parks or forests, they may want to offer them nuts or other food.
However, repeatedly feeding wild animals can change their natural foraging behavior and encourage them to become dependent on humans.
Artificial feeding can also cause many animals to gather in one location, potentially increasing disease transmission.
It is generally better to observe wild squirrels without feeding them.
Signs of Squirrels in the Forest
Even when you do not see a squirrel directly, you may find evidence of its presence.
Common signs include:
- Pine cones with scales removed
- Gnawed nutshells
- Tracks around trees
- Nests in trees
- Feeding remains
Pine cones that have been systematically stripped of their scales can be particularly useful evidence of squirrel feeding activity.
Excellent Jumping Ability
Eurasian red squirrels are excellent jumpers.
Their powerful hind legs propel them from one branch toward another.
The long tail helps maintain balance and body orientation while they are airborne.
When landing, their sharp claws grip branches and bark.
These abilities allow them to move rapidly through the forest canopy while escaping predators.
Ecological Role
Eurasian red squirrels play several roles in forest ecosystems.
First, by transporting and storing seeds and nuts, they may contribute to seed dispersal.
Second, because they consume fungi, their movements may also contribute to the dispersal of fungal spores.
Third, squirrels themselves provide food for predators such as birds of prey, martens, and leopard cats.
A simplified food relationship might look like:
Trees, Seeds, and Fruits → Eurasian Red Squirrel → Birds of Prey and Carnivorous Mammals
In this way, squirrels help connect plants and predators within forest food webs.
Can Eurasian Red Squirrels Live in Cities?
Eurasian red squirrels are not restricted to remote mountain forests.
They may also occur in large parks, urban woodlands, and green spaces where there are enough mature trees and suitable food.
However, urban environments can expose them to additional dangers such as vehicles, human disturbance, and fragmented habitat.
Connections between urban green spaces and surrounding forests can help squirrels and other wildlife move safely between habitats.
Interesting Facts
One of the most interesting behaviors of the Eurasian red squirrel is its food-caching strategy and ability to relocate stored food.
During seasons when nuts and seeds are abundant, squirrels hide food in many different locations.
When food becomes scarce, they search these areas and recover some of their stored supplies.
However, not every hidden seed is retrieved.
Some forgotten seeds may germinate and eventually develop into new plants, meaning that squirrel food storage can indirectly contribute to forest regeneration.
Relationship with Humans
The Eurasian red squirrel is a relatively familiar wild animal in Korean forests and parks.
It usually causes little direct harm to humans, although squirrels may occasionally feed on fruit or nuts grown in orchards and agricultural areas.
Within natural ecosystems, however, they transport seeds and serve as prey for a variety of predators.
Therefore, the Eurasian red squirrel is much more than a small animal that eats nuts. It is closely connected to the structure and function of forest ecosystems.
The Eurasian red squirrel (Sciurus vulgaris), known as Cheongseolmo in Korea, is a characteristic wild rodent found in Korean forests, mountains, and wooded parks.
Its long, bushy tail, powerful hind legs, and sharp claws make it an excellent climber capable of moving quickly along tree trunks and jumping between branches.
It mainly feeds on acorns, pine seeds, walnuts, chestnuts, fruits, fungi, and other plant materials. When food is abundant, it may hide nuts and seeds in multiple locations and return to them later.
Some stored seeds are never recovered and may eventually germinate, allowing squirrels to contribute indirectly to seed dispersal and forest regeneration.
Eurasian red squirrels also serve as prey for birds of prey, martens, leopard cats, and other predators, making them an important part of forest food webs.
Because they do not spend the entire winter in deep hibernation, they can sometimes be seen even during the colder months.
With their impressive climbing skills, bushy tails, and fascinating food-storing behavior, Eurasian red squirrels are among the most recognizable and interesting wild mammals of Korea’s forests.
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