Squirrels are furry rodents who survive mainly on nuts and grains. There are many species of squirrels, however most squirrels in southern Ontario are "Eastern Grey" type. Eastern Greys include the all black squirrels too - black or dark brown is just one colour they come in. Like all rodents, squirrels have sharp, strong teeth and powerful jaws that enable them to chew holes through most building materials and to get into buildings. Squirrels typically become a nuisance and cause damage when they get into attics or chew holes in roofs, eaves, gutters, and soffits. Squirrels can also create a fire hazard when they chew or gnaw on electrical wiring.