The Sulawesi giant squirrel is active during the daytime, when it travels and forages in the forest understorey and on the ground (2). The varied diet of the Sulawesi giant squirrel comprisesfruits, such as figs and fruit from the pohon dongi (Dillenia serrate) and seeds, such as those of the pohon pangi (Pangium edule) plant. The Sulawesi giant squirrel also feeds on insects, such as termites and beetle larvae, which are picked off leaf litter and tree trunks or dug out from rotting wood (2).
The fruit of Pangium edule is large and woody and contains large, hard seeds. Often the sound of the squirrel gnawing on tough seeds such as this are the only indicator of this quiet and wary squirrel’s presence (2). An easily startled animal, the Sulawesi giant squirrel is often just seen as reddish streak disappearing into the forest undergrowth (2).
The nest of the Sulawesi giant squirrel is a large, globular structure, measuring about 30 centimetres in diameter. The nest is constructed from the long, black sturdy fibres of the sugar palm (Arenga pinnata) and is typically placed in the cavity of a large tree trunk, not far from the ground (2). Little else is known about the breeding biology of this elusive animal.