Grotesque squirrels covered in oozing sores have been spotted invading backyards in the US and Canada. Hairless tumors develop from their heads and eyes to their legs, feet, and genitals. First thought to be squirrel pox, the illness is more likely to be squirrel fibromatosis. Homeowners who put bird feeders in their yards may be unintentionally causing the virus to spread to more squirrels throughout North America.
