Female And Male Grey Squirrels. They are particularly common in the eastern region of the united states during the first year of life, female squirrels are not able to breed. Grey squirrels are also referred to as cat squirrels or migratory squirrels.
Nests (dreys) are constructed from hardwood twigs and leaves, and lined by dry leaves and grass, sited along branches or, in residential settings, attached to buildings.
Essentially, both sexes breed with multiple partners. Competition is the tool used to determine which males will mate. Values shown are mean ± one. Female ground squirrels emerge from hibernation later than their male counterparts.