If you’ve been hearing about “zombie squirrels” in Colorado, you’re probably wondering what’s really going on. These reports—squirrels stumbling, spinning in circles, or acting disoriented—are often linked to parasites or viral infections that can alter behavior. Some squirrels even develop visible growths or wounds caused by squirrel fibroma virus, a poxvirus that produces large skin tumors. While alarming to see, these unusual conditions rarely pose a direct threat to humans or pets, though they can indicate broader ecosystem issues.

Understanding why squirrels behave or appear this way is important for protecting your home, pets, and local wildlife. At Skedaddle, we’ve spent over 30 years helping Colorado residents manage wildlife safely and humanely. In this article, we break down the science behind “zombie squirrels,” the impacts on our environment, and practical steps you can take to handle these situations responsibly.

Squirrel Behavior Explained: What Are “Zombie Squirrels”?

Many people have witnessed squirrels acting “zombie-like,” displaying irregular movements, apparent confusion, or even aggressive outbursts. These symptoms can be troubling, but they stem from specific causes:

• Viral infections such as squirrel pox, distemper, or fibroma virus
  
• Parasitic illnesses that affect the brain
  
• Severe head injuries, often from falls or vehicle strikes
  
• Exposure to consumed toxins or chemicals
  

Squirrel fibroma virus in particular has fueled the “zombie” reputation. It spreads mainly through mosquitoes or fleas and results in fibromas—benign but sometimes large tumors—around a squirrel’s limbs, body, or head. These growths can bleed or interfere with vision and movement, making squirrels appear dazed or disoriented.

Spotting a squirrel that appears to be spinning, unable to walk straight, or covered in lumps does not mean Colorado is facing a rodent apocalypse. Instead, these are signs of illness or injury, often linked to viral outbreaks such as distemper, squirrel pox, or fibroma virus.

Effects of Squirrel Viral Outbreaks on Colorado’s Ecosystem

The sight of a “zombie” squirrel can be shocking, but it also signals deeper impacts for the environment. Squirrels are a vital part of Colorado’s natural spaces, especially in wooded neighborhoods and city parks from Denver to Boulder.

• Viral outbreaks can reduce squirrel numbers, affecting birds of prey and other predators that depend on them for food.
  
• Seed and nut dispersal may be impaired, since squirrels play a key role in supporting local trees and plants.
  
• The food chain can shift if squirrel populations decline, sometimes leading to increases in other rodent species.
  
• Sick or visibly injured squirrels are more vulnerable to predation.
  
• Large outbreaks can disrupt community use of outdoor spaces.

These outbreaks are unpredictable and may peak during certain seasons, particularly in areas with high squirrel densities, like neighborhoods bordering the Rocky Mountain foothills. Similar to “masked” raccoon invasions, they highlight the necessity for community readiness and attentive wildlife management at home and on business properties.

Community Safety Tips for Wildlife Encounters

While the viral outbreaks leading to zombie-like squirrel behavior may seem frightening, the right knowledge can make interactions safer for everyone. Residents and business owners should keep the following critical steps in mind:

• Never attempt to touch or aid a sick or strangely behaving squirrel, no matter how distressed it appears.
• Keep all pets, especially dogs, on a leash and away from wildlife.
• Secure outdoor garbage, bird feeders, and pet food to avoid attracting sick or potentially contagious animals.
• Cover entry points into homes, attics, and sheds to prevent squirrels—healthy or sick—from finding shelter.
• Teach children not to approach wild animals and explain the importance of respecting wildlife.

If you notice a “zombie squirrel” on your property or see an animal displaying strange symptoms, do not try to handle the situation yourself. Instead, contact local animal control or a professional wildlife removal service for expert help.

The Role of Homeowners and Business Owners

Responsibility doesn’t begin and end at the property line. In a fast-growing urban area like Denver or the vibrant neighborhoods near the Rockies, every household and business plays a part in local wildlife management.

Here are five key steps you can take to support a balanced, safe wildlife environment:

• Schedule regular property inspections, particularly in the fall when squirrel activity spikes.
• Seal all gaps, vents, and rooflines to prevent easy access for squirrels.
• Remove fallen fruit, nuts, or seeds from yards to reduce attractants.
• Report all recurring wildlife incidents to local authorities for effective tracking.
• Educate neighbors and employees about safe wildlife practices and encourage community action.

Alongside preventing physical entry into homes and businesses, responsible management means treating wild animals, including those showing unusual or sickly behavior, with care and caution. These actions minimize the risk of accidental bites, property damage, and the spread of disease. They also reduce the likelihood of wildlife taking up residence in your attic or walls—a major source of the calls we receive at Skedaddle.

How Skedaddle Handles Unusual Squirrel Encounters

At Skedaddle, every situation involving “zombie squirrels” is unique. Our professional approach is rooted in a deep understanding of animal behavior and Colorado’s varied home construction styles, from century-old houses to modern mountain homes.

Here’s what sets the Skedaddle approach apart in managing squirrel issues, including those involving unusual or sick squirrels:

• Comprehensive, hands-on inspections to identify every entry point—even hidden ones in attics or along rooflines.
• Gentle, humane removal techniques to safely clear adult and baby squirrels, minimizing distress and health risks.
• Detailed cleaning of contaminated areas, with removal of all nesting material, droppings, and soiled insulation to restore a safe, healthy environment.
• Professional sealing and repairs, using high-grade materials to keep squirrels out for good.
• Long-term follow-up and community support to address recurring Colorado wildlife issues.

In cases of viral outbreaks or sick animals, we adhere to local guidelines to ensure everyone’s safety. Our technicians, trained in disease prevention and wildlife handling, are prepared to address both the aesthetic (mess, noise, odors) and ecological aspects (spread of illness, animal population impacts) of any outbreak.

Moving Beyond Fear: A Community Approach to Wildlife Health

Recent headlines often emphasize the fear factor, focusing on the horror of “zombie squirrels” while overlooking the real importance: protecting our ecosystem and community health. Safe interaction and a science-based approach are key. Residents of Denver, Boulder, and communities along the Front Range are no strangers to wildlife encounters. By centering public response on accurate information, prevention, and quick action through skilled professionals, we can minimize risk and keep our neighborhoods vibrant and safe.

Consider these practical reminders for a balanced approach: Stay updated on local wildlife advisories and community alerts, encourage neighbors to report abnormal squirrel behavior to prevent spread, be patient with natural wildlife cycles—even sick animals have a role in the ecosystem, invest in preventive maintenance for your property as part of responsible ownership, and reach out to wildlife experts for questions or assistance rather than relying on rumors or sensational coverage. Building trust in safe, expert-backed wildlife management keeps the focus where it matters most: keeping local communities and natural habitats healthy, resilient, and welcoming for everyone who calls this state home.

Take Charge of Your Wildlife Concerns with Confidence

The recent surge in abnormal squirrel behavior across local areas highlights the critical need for awareness, preparedness, and expert intervention. While unsettling headlines may spread fear about “zombie squirrels,” recognizing the genuine risks and ecological impacts allows communities to respond proactively and protect both residents and native wildlife. From the spread of disease to property vulnerabilities, these challenges require vigilance at home and reliable, humane solutions.

If you suspect squirrel activity or spot unusual wildlife behavior around your property, don’t leave your safety and peace of mind to chance. Trust Skedaddle’s three decades of expertise to remove squirrels responsibly, assess every entry point, and secure your home against future intrusions. Reach out today to ensure your property—and your neighborhood—remains safe, healthy, and resilient for seasons to come.