Strange images of squirrels with bald patches, oozing sores, and wart-like growths have been making the rounds on social media, sparking alarm among animal lovers and casual observers alike. Dubbed “zombie squirrels” online, these grey squirrels have been spotted in gardens and backyards across parts of the United States, particularly in Maine, and in some regions of Canada.

According to reports, the animals appear with pus-filled tumours on their bodies and heads, giving them a disturbing, zombie-like appearance. The phenomenon has left many wondering whether these creatures pose a danger to humans or other animals.

Disease Behind Shocking Sightings

Wildlife experts say the condition is caused by squirrel fibromatosis, a viral skin disease linked to the leporipoxvirus. This virus spreads through direct contact among squirrels, often via saliva when they fight, groom, or feed in close proximity. Similar to the way herpes spreads in humans, once the virus is present in a local population, it can move quickly.

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The rise in sightings has been partly attributed to backyard bird feeders, which serve as congregation points for squirrels. Experts believe that when these animals gather in large numbers around feeders, the risk of spreading the virus multiplies.

Although the disease is alarming in appearance, it is not new. Fibromatosis has been documented in squirrels for decades. The tumours can be external, appearing as bulging warts, or internal, potentially affecting organs. While most squirrels eventually recover, in some cases the disease can become fatal.

Are Humans At Risk?

The good news is that the virus does not affect humans, pets, or birds. Wildlife biologist Shevenell Webb from Maine’s Department of Inland Fisheries and Wildlife stressed that people should not attempt to touch or capture the infected squirrels. “Despite their appearance, they aren’t dangerous to humans,” Webb told the Bangor Daily News.

However, experts caution that handling sick wildlife can create unnecessary stress for the animal and increase risks of secondary injuries. The best approach, they emphasise, is to leave the squirrels alone and let nature take its course.

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While the sight of “zombie squirrels” may be unsettling, wildlife officials stress that these cases are part of natural cycles in animal populations. In most instances, the affected squirrels will heal without human intervention. For now, experts suggest minimising artificial gathering spots like bird feeders to reduce the spread of the virus.