The Secret Lives of Squirrels: Understanding Their Sociology and Success as Pests

Squirrels, with their bushy tails and acrobatics, are more than cute — they’re extremely good at living alongside us. Their nesting, diet, habitat flexibility, and survival tricks all make them successful (and sometimes annoying) in urban, suburban, and agricultural settings.

Nesting Habits and Social Structures

Squirrels use smart nesting and seasonal social behavior to stay safe and raise young.

• Nesting habits: They build two main nest types:
  • Dreys — twig-and-leaf nests in tree branches.
  • Dens — nests in tree cavities or even buildings.
  Both protect them from weather and predators, and they’re usually well insulated.
• Social structures: Most tree squirrels are basically solitary, but they interact more during breeding. Males chase and compete for females; females raise the young alone. Juveniles may stay in the nest for weeks to months before dispersing.

Preferred Food Sources

Squirrels are classic generalists — if it’s edible, they’ll try it.

• Nuts and seeds: Acorns, walnuts, pecans and other high-fat foods are their winter survival fuel.
• Fruits and vegetables: Gardens, orchards, berries, fungi — this is why they’re a nuisance in ag and backyard settings.
• Bird eggs and insects: Less common, but some species will opportunistically take eggs or animal protein.

Habitat Preferences

They do great almost anywhere there are trees or human food.

• Urban settings: Parks, street trees, bird feeders, trash — cities are squirrel buffets.
• Suburban settings: Yards with trees and attics to sneak into are ideal; this is where they chew wires or nest in soffits.
• Agricultural settings: Orchards, grain, and stored crops make farms extra attractive, and damage can be noticeable.

Survival Mechanisms

These are the reasons they’re so hard to “get rid of.”

• Agility and speed: They can climb, jump, and escape predators (and people) quickly.
• Food caching: They hide extra food in multiple spots so they have winter reserves.
• Adaptability: If one food or habitat source disappears, they switch to another.
• Sharp teeth and strong jaws: Constantly growing incisors let them chew through nuts — and also wood, plastic, and sometimes wiring.