Why ‘Zombie Squirrels’ Have Been Appearing In The U.S. And Canada

Zombie squirrels have been making headlines recently in the U.S. and Canada, with reports of squirrels sporting strange, sometimes bleeding lumps on their bodies. These lumps, which resemble tumors, are actually non-cancerous growths called fibromas. While they may not always pose a serious threat to squirrels, they can become problematic if they impede vital structures or spread internally.

The cause of these zombie squirrels is a virus known as leporipoxvirus, which is part of the pox group of viruses. Squirrels can contract this virus through mosquito or flea bites, as well as direct contact with infected squirrels. The tumors typically develop at the site of transmission, whether it be from an insect bite or physical contact with another squirrel.

Unfortunately, there is currently no treatment for squirrel fibromatosis. However, in less severe cases, the lesions may regress over time, allowing squirrels to fully recover. Despite the alarming appearance of these zombie squirrels, there is no evidence to suggest that the North American population of grey squirrels, the most commonly affected species, is being significantly impacted by this disease.

While the transmission of leporipoxvirus has only been documented in squirrels in nature, laboratory experiments have shown that rabbits and woodchucks can also be infected. For humans, the risk of contracting the virus appears to be low, even if they were to consume an infected squirrel. However, there is a theoretical possibility that the virus could mutate to infect humans in the future.

For now, there is no need for humans to fear encountering a zombie squirrel. These creatures may look intimidating, but they pose no immediate threat to human health. So if you happen to come across a zombie squirrel in the wild, there’s no need to panic or run away. Just observe from a safe distance and appreciate the wonders of nature.