Koprowski, J. L. 1988. Longevity records for the fox squirrel. Journal of Mammalogy 69(2): 383-384

A new longevity record for the fox squirrel, Sciurus niger rufiventer, is available in the records of the Rose Lake Wildlife Experiment Station near East Lansing, Michigan. One squirrel known to be 7½ years old was shot on the station on October 25, 1956, and another, at least 7½ years old, was shot there on October 23, 1952. These are the oldest squirrels in the 18-year record of the station. Regular live-trapping and tagging of game animals, exceptionally heavy hunting, and a bag check of all hunters on the station insure a high recovery of tagged animals.