Squirrels are often seen as playful, charming visitors in backyards, but recently, many Americans have been disturbed by sightings of so-called “zombie squirrels” covered in oozing sores and wart-like growths. These images and videos have gone viral on social media, showing disfigured squirrels with lumps that look alarming and eerie.
One Reddit user shared a photo of a squirrel with a large growth on its face, initially thinking the animal had been eating something stuck there. However, wildlife experts say these creatures are likely suffering from squirrel fibromatosis, also known as squirrel pox—a viral disease caused by the leporipoxvirus, which creates wart-like tumors that may ooze fluid.
The disease is quite common, affecting squirrel populations across the U.S. and Canada. In particular, residents in Maine have seen squirrels with scaly, oozy growths, raising concerns but also requiring caution. A wildlife biologist from the Maine Department of Inland Fisheries and Wildlife explained that the virus will run its course naturally and stressed that people should avoid handling infected animals to reduce risk of spreading it further.
Squirrel pox spreads fast, especially when squirrels gather around bird feeders, where saliva from an infected squirrel can contaminate seeds. It spreads much like human viruses in crowded spaces. Although the growths look disturbing, most squirrels survive unless the tumors affect vital organs or their ability to eat or see.
Aside from poxvirus, some squirrels suffer from botfly infestations that cause lumps under the skin. Wildlife experts warn only trained rehabilitators should attempt to remove such parasites safely.
Social media users have nicknamed these affected animals “zombie squirrels,” often with a mix of alarm and humor. Despite their frightening appearance, experts confirm the virus is species-specific and does not pose a threat to people, cats, or dogs. Rarely, rabbits may contract the virus, but it is unusual.
The Wisconsin Department of Natural Resources explains the disease is usually spread by biting insects like mosquitoes, which transmit the virus between squirrels.
Although the images may be unsettling, there is hope. Many squirrels recover fully once the virus passes, with scars but restored health. Videos shared by wildlife enthusiasts show previously infected squirrels bouncing around and socializing again.
Experts advise backyard viewers to keep their distance when they spot infected squirrels and recommend removing feeders to prevent further spread until the outbreak passes. Ultimately, patience and caution are the best responses to the mysterious “zombie squirrels” running through neighborhoods.
