Aspects of this topic are discussed in the following places at Britannica.
...one species, the dusky bush baby (G. matschiei), is restricted to the rainforests of eastern Congo (Kinshasa). They feed on gum, insects, pods, flowers, and leaves. The larger Allen’s bush baby (G. alleni) and its relatives live in the rainforests of west-central Africa, where they feed on fallen fruits and the insects that they find in them; they may be...
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