Types Of Squirrels In North America

Types of Squirrels in North America: A Comprehensive Guide to Our Busy Neighbors

Squirrels are among the most familiar and charismatic wildlife encountered across North America, from bustling city parks to remote mountain forests. Their energetic antics and bushy tails make them a constant source of amusement and curiosity. Yet, beneath this common familiarity lies a remarkable diversity. The continent is home to over 200 species of squirrels, all belonging to the family Sciuridae. This guide explores the major types of squirrels in North America, delving into their unique adaptations, behaviors, and the vital ecological roles they play. Understanding these differences transforms a simple backyard sighting into a moment of genuine wildlife appreciation.

The Three Main Groups: Tree, Ground, and Flying

Biologists classify North American squirrels into three primary ecological groups: tree squirrels, ground squirrels, and flying squirrels. This division is based on their primary habitat, locomotion, and nesting behavior, though some species exhibit traits from multiple categories.

Tree Squirrels: The Archetypal Acorn Collectors

Tree squirrels are the quintessential squirrels most people picture. They are arboreal, spending the majority of their lives in trees, building nests called dreys (made of leaves and twigs) or utilizing tree cavities. They are generally solitary, diurnal (active during the day), and possess the classic long, bushy tail used for balance, communication, and warmth.

Common and Widespread Species:

• Eastern Gray Squirrel (Sciurus carolinensis): The most ubiquitous and recognizable squirrel in eastern North America, now also introduced to western regions and parts of Europe. Highly adaptable, they thrive in urban, suburban, and forested areas. Their color varies from gray to black (melanistic) and even white (albino or leucistic).
• Fox Squirrel (Sciurus niger): The largest tree squirrel in North America. They have a distinctive rusty-orange belly and a more robust build than gray squirrels. Their range covers the eastern and central U.S., often preferring open woodlands and forest edges.
• American Red Squirrel (Tamiasciurus hudsonicus): Smaller and feistier than the gray or fox squirrel, with a solid reddish back and white belly. They are fiercely territorial and are known for their loud, scolding calls. They are primarily conifer forest specialists, storing large quantities of pine cones in a central cache called a midden.
• Douglas Squirrel (Tamiasciurus douglasii): The western counterpart to the American red squirrel, found in coniferous forests of the Pacific Northwest. They have a similar territorial behavior and reddish coloration but with distinct markings.
• Abert's Squirrel (Sciurus aberti): A striking species with a tufted ear and a predominantly gray body with a rufous (reddish) stripe down its back. It is a specialist of ponderosa pine forests in the southwestern U.S., almost entirely dependent on these trees for food and nesting.

Ground Squirrels: Masters of the Burrow

Ground squirrels are, as their name suggests, primarily terrestrial. They live in extensive underground burrow systems, which provide shelter from predators and extreme weather. They are often more social than tree squirrels, living in colonies. Most ground squirrels hibernate during the winter, a key distinction from their tree-dwelling cousins. Their tails are generally less bushy and more wiry.

Notable Ground Squirrels and Relatives:

• Thirteen-Lined Ground Squirrel (Ictidomys tridecemlineatus): Named for the series of light stripes along its back, this small, striped squirrel is a common sight in grasslands and prairies across the central and northern U.S. and southern Canada. They are prolific hibernators and have cheek pouches for carrying food.
• Golden-Mantled Ground Squirrel (Callospermophilus lateralis): Found in mountainous regions of the western U.S., it is