Tamiasciurus hudsonicus

Family: Sciuridae

American Red Squirrel (Tamiasciurus hudsonicus) is a small, quick-moving tree squirrel whose character is often noticed before its full shape is seen. Its sharp calls, sudden pauses, pale underparts, and restless movement through branches make it one of the most distinctive mammals of northern woods and mixed conifer edges in Minnesota.

For representative images and visual context, see the page: American Red Squirrel in the Gallery section.

Description

Tamiasciurus hudsonicus is recognized by:

Size: small for a tree squirrel, noticeably smaller and lighter-built than Eastern Gray Squirrel or Fox Squirrel
Coat: rusty red to reddish-brown upperparts, with a clean white or pale cream belly; the back may look grayer or duller in some seasons
Head: rounded head, relatively short muzzle, large dark eye, and often a distinct pale eye ring; ear tufts may be visible in colder seasons
Structure: slender body, agile limbs, and a moderately bushy tail that is usually carried high, arched, or flicked while the animal is alert
Sex differences: males and females appear broadly similar in the field, with little obvious difference in color or structure at normal viewing distance

The overall field impression is of a compact, bright, intensely alert squirrel that seems almost spring-loaded even when still.

Habitat and Range

Typical habitats include:

Conifer forest, especially pine, spruce, and fir
Mixed woodland with both conifers and hardwoods
Woodland edge, shelterbelts, parks, or older neighborhoods where conifers are present

Notes may include:

In Minnesota, red squirrels are strongly associated with northern forest habitats but can also appear farther south anywhere mature conifers provide food and cover
They are present year-round and remain active through winter rather than hibernating
The species is most often encountered in trees, along trunks, or moving between branches near cone-bearing or seed-producing cover
Areas with spruce, pine, or dense evergreen planting often reveal them by sound before sight

Identification

Key features for field diagnosis:

Shape: small-bodied, narrow-chested, and quick in posture, often crouched low on bark or balanced lightly on branches
Coat: warm reddish tones above with a sharply paler underside; the contrast is often visible even at moderate distance
Head and tail: rounded ears, pale eye ring, short face, and a tail that looks lively rather than full and heavy
Movement: rapid climbs, short bounds, abrupt stops, and quick repositioning around trunks or along limbs
Behavior: frequent scolding calls, tail flicking, vigilant pauses, and determined food-carrying behavior

The combination of small size, reddish coat, pale belly, quick movement, and sharp vocal presence helps separate this species from larger gray or fox squirrels in the field.

Behavior and Ecology

Usually encountered alone, especially when foraging or moving through a defended feeding area
Strongly territorial around food stores, with repeated vocal scolding and chases when another squirrel enters its space
Nests in tree cavities or in external leaf-and-twig dreys, often placed where cover is dense
Feeding behavior or diet may include:
- Primary food type: conifer seeds and cones
- Secondary food type: nuts, buds, seeds, berries, and insects when available
- Seasonal food source: mushrooms and other fungi, often carried or cached for later use

Its constant harvesting, caching, and movement make it an important part of woodland seed and fungal ecology, and one of the most conspicuous small mammals in conifer-rich habitat.

Notes

The species often announces itself with a dry, repeated chatter from the canopy before the animal is fully visible
In photographs and field views alike, the forepaws, whiskers, and lifted tail contribute strongly to its expressive, watchful posture
Winter individuals may show more obvious ear tufts and a somewhat grayer cast along the back, while the pale belly remains a useful contrast
A squirrel carrying a mushroom is a particularly memorable field mark of behavior, reflecting the species’ energetic seasonal food-gathering habits

References

Minnesota Department of Natural Resources
https://www.dnr.state.mn.us
Animal Diversity Web
https://animaldiversity.org
iNaturalist taxon page
https://www.inaturalist.org