The recent sighting of 'zombie squirrels' with oozing warts in US backyards has sparked curiosity and concern. These gruesome-looking squirrels, covered in hairless patches and gnarly warts, have been spotted in various states, including Florida, North Carolina, and Michigan. While the sight is undoubtedly unnerving, the cause of these deformities is not as terrifying as it seems. Experts attribute the phenomenon to squirrel fibromatosis, a viral skin disease caused by leporipoxvirus, which is similar to herpes in humans. This virus spreads through direct contact between healthy squirrels and the lesions or saliva of infected squirrels, much like how herpes is transmitted. It's important to note that this virus is distinct from squirrelpox, which is more common in the UK and can be fatal to red squirrels. The leporipoxvirus leads to wart-like tumors that ooze fluid, and while the condition often clears up on its own, severe cases can affect internal organs and lead to death. The surge in sightings of infected squirrels in August 2025, particularly in states like Maine and parts of Canada, could be attributed to bird feeders, where infected animals expose other squirrels to the virus through saliva or other fluids on uneaten seeds. Despite the concerning appearance, wildlife experts assure that these squirrels pose no threat to humans, pets, or birds. Residents are advised to let the animals heal on their own, as the tumors typically resolve within four to eight weeks. While the sight of these 'zombie squirrels' may be unsettling, it's a reminder of the intricate web of interactions between wildlife and their environment, and the importance of understanding and respecting the natural world.
