Red Squirrel

About

The American Red Squirrel (Tamiasciurus hudsonicus) is a small, diurnal, arboreal rodent native to North America. It is often mistaken for a bird due to its agility and vocalizations, but it is unequivocally a mammal, specifically a squirrel. This species is known for its territorial behavior, caching habits, and distinctive chattering calls. It plays a significant ecological role in seed dispersal within its coniferous forest habitats.

Size & lifespan

Length

16-23 cm (6.3-9.1 in) excluding tail

Wingspan

N/A (mammal, no wingspan)

Weight

140-280 g (4.9-9.9 oz)

Lifespan

2-7 years in the wild, up to 10 years in captivity

Diet

Omnivore (primarily conifer seeds, nuts, fungi, buds, sap, occasionally bird eggs or nestlings)

Physical characteristics

Plumage

The Red Squirrel has reddish-brown fur on its back, often with a rusty or orange hue, and a white or off-white belly. A dark lateral stripe may be present between the red back and white belly, especially in summer. The tail is bushy and often edged with white or black hairs.

Beak shape

N/A (mammal, no beak)

Eye color

Dark brown to black

Leg color

N/A (mammal, fur-covered legs)

Distinguishing features

Small size, reddish-brown dorsal fur, white belly, bushy tail, and a prominent white eye-ring. They have sharp claws for climbing and strong incisors for opening cones and nuts.

Juvenile appearance

Juveniles resemble adults but may have slightly duller coloration and a less developed bushy tail. The dark lateral stripe might be less pronounced or absent.

Seasonal changes

Winter fur is typically thicker and slightly grayer or duller red than the brighter summer coat. The ear tufts may be more prominent in winter.

Sexual dimorphism

Minimal; males and females are generally similar in size and appearance, though females may be slightly larger when pregnant.

How to identify

1. 1

   Size and Shape

   Look for a small, slender squirrel with a relatively short, bushy tail compared to larger tree squirrels.

2. 2

   Coloration

   Observe the reddish-brown fur on the back and sides, contrasting with a white or off-white belly. A dark stripe may separate these colors.

3. 3

   Head Marks

   Note the prominent white ring around the eyes, which is a key distinguishing feature.

4. 4

   Behavior

   Listen for its characteristic chattering and scolding calls. Watch for its energetic, jerky movements and its habit of caching cones in large middens.

5. 5

   Habitat

   Primarily found in coniferous and mixed forests, especially where spruce, pine, and fir trees are abundant.

Habitat & range

Biomes

Boreal forests, coniferous forests, mixed forests, and occasionally deciduous forests.

Geographic range

Widespread across North America, from Alaska and Canada south through the Rocky Mountains to Arizona and New Mexico, and east through the Great Lakes region and Appalachian Mountains.

Elevation range

Sea level up to 3,600 meters (12,000 feet) in mountainous regions.

Preferred environments

Mature coniferous forests (spruce, pine, fir) with abundant cone production, as well as mixed woodlands. They require trees for shelter, nesting, and food, and often utilize fallen logs and underground caches for food storage.

Behavior

Activity time

Diurnal, most active during early morning and late afternoon, though they can be active throughout the day.

Feeding habits

Primarily granivorous, specializing in conifer seeds. They meticulously strip scales from cones to extract seeds. They also consume fungi (including toxic varieties), nuts, buds, sap, and occasionally bird eggs or nestlings. They are famous for creating large middens (piles of discarded cone scales) near their caches.

Social behavior

Highly territorial and largely solitary, especially adults. They aggressively defend their middens and core territories from other squirrels. Interactions are often vocal and involve chases.

Flight pattern

N/A (mammal, no flight)

Migration pattern

Non-migratory; they are year-round residents within their territories.

Territoriality

Extremely territorial, especially around their food caches (middens). They use scent marking, vocalizations, and aggressive displays to defend their territory from conspecifics.

Breeding & reproduction

Breeding season

Typically two breeding periods: late winter/early spring (February-April) and mid-summer (June-August), depending on food availability and geographic location.

Nesting habits

Nests are often built in tree cavities, abandoned bird nests, or dreys (leaf nests) in tree branches. They may also use underground burrows, especially for overwintering or raising young.

Clutch size

Typically 3-5 young (pups) per litter.

Egg description

N/A (mammal, live birth)

Incubation period

N/A (mammal, gestation period is approximately 31-35 days)

Fledging period

N/A (mammal, young are weaned at 7-8 weeks and become independent shortly after)

Parental care

Females are the primary caregivers, raising the young alone. Pups are born altricial (helpless, blind, and hairless) and are dependent on the mother for several weeks.

Where to find

Field tips

1. Listen for Calls. Their loud, chattering calls are often the first indication of their presence. They are very vocal, especially when disturbed or defending territory.
2. Look for Middens. Search for large piles of discarded cone scales at the base of trees or under logs. These middens are clear signs of Red Squirrel activity and often indicate a nearby cache or den.
3. Scan Tree Trunks and Branches. They are arboreal and spend much of their time climbing trees. Look for movement along branches or up and down trunks.
4. Be Patient and Quiet. While vocal, they can also be wary. Moving slowly and quietly will increase your chances of observing their natural behavior.
5. Early Morning/Late Afternoon. These are typically their most active periods for foraging and caching.

Similar species

Quick facts

Primary Diet:

Conifer seeds

Social Structure:

Solitary and territorial

Distinguishing Mark:

White eye-ring

Habitat Preference:

Coniferous forests

Vocalization:

Loud chattering calls

Fun facts

• Red Squirrels are known for their 'middens,' which are large piles of discarded cone scales that can sometimes be several feet high and wide, representing years of caching activity.
• They are one of the few mammals that can digest the toxins found in certain fungi, allowing them to cache and consume mushrooms that are poisonous to other animals.
• Despite their small size, they are fiercely territorial and will aggressively defend their food caches from much larger animals, including other squirrels, chipmunks, and even humans.
• Their scientific name, Tamiasciurus, combines 'Tamias' (chipmunk) and 'Sciurus' (squirrel), reflecting their intermediate size and some chipmunk-like behaviors.
• Red Squirrels play a crucial role in forest ecology by dispersing seeds, as some of their cached cones are forgotten or not fully consumed, leading to new tree growth.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Rodentia

Family

Sciuridae

Genus

Tamiasciurus

Species

Tamiasciurus hudsonicus

Explore the Red Squirrel