The forest giant squirrel is solitary and diurnal. It forages primarily for the fruits and seeds of trees and lianas; it can crack open the tough nuts of "Panda oleosa", "Coula edulis", "Klainedoxa gabonensis", "Elaeis", and "Irvingia" spp.. The diet also includes some other plant material and a very small proportion of insects. The squirrel has a home range of a few hectares and seems to avoid other squirrels or drive them away from a tree where it is feeding. Vocalisations include two types of alarm calls. This squirrel is preyed on by eagles and other large birds of prey.