Squirrels are a familiar sight, often seen darting up trees or foraging on the ground. As these animals navigate their arboreal world, they frequently utilize distinctive nests constructed high in the branches. These visible structures often spark curiosity about their specific name and purpose.
The Squirrel’s Nest: Called a Drey
A squirrel’s nest is known as a drey. This term is used for the nests of tree squirrels, flying squirrels, or ringtail possums. These structures vary in size and materials depending on the squirrel species and region. An Eastern gray squirrel drey, for example, is typically a hollow sphere measuring about 30 centimeters (12 inches) in diameter, sometimes reaching up to 60 centimeters (2 feet) wide.
Dreys are constructed from interwoven twigs and branches, often starting with small, gnawed-off branches. Squirrels pack damp leaves and moss on top to reinforce the structure, creating a messy, ball-like appearance. The interior is then lined with finer, softer materials such as grass, moss, shredded bark, pine needles, or feathers. This careful layering creates a sturdy and insulated home.
Purpose and Placement of Dreys
Squirrels construct dreys primarily for shelter and protection. These nests offer refuge from harsh weather conditions, including rain, wind, and cold. The thick walls provide insulation. Dreys also serve as a safe haven from predators, such as hawks or raccoons.
Dreys are commonly located high in trees, 6 meters (20 feet) or more above the ground. A favored site is a tree crotch or the fork of strong branches, often close to the trunk, which provides stability. This placement offers security and makes the drey less accessible to ground predators. While found primarily in trees, squirrels may occasionally build dreys in human structures, such as attics or exterior walls.
Beyond the Drey: Other Squirrel Habitats
While dreys are common, squirrels also utilize natural tree cavities. These hollows, sometimes called dens, offer a more permanent and preferred nesting site. Tree cavities provide excellent protection from weather and predators. Squirrels may use existing holes, such as those abandoned by woodpeckers, or natural hollows that form in old trees.
Tree cavities offer insulation and a secure environment for raising young, especially during colder months. While dreys are often used during warmer seasons, squirrels frequently prefer tree cavities for winter and for giving birth to their litters.