A squirrel can live up to 30 years, but many are eaten by predators or killed early. The squirrel's lifespan depends mainly on the type of squirrel. According to the New York College of Environmental Science and Forestry, habitat can also play a role in the squirrel's lifespan.
There are over 200 squirrel species classified into three categories: ground squirrels, tree squirrels and flying squirrels.
According to National Geographic, squirrels live all over the world with the exception of Australia. The tiniest squirrel is the African pygmy squirrel, which is about 5 inches long. The largest is the Indian giant squirrel, which can be as large as 3 feet.