spends up to 95% of its feeding time eating lichens. Fungi are very rare in tropical rainforests compared to other food sources such as fruit and leaves, and they are also distributed more sparsely and appear unpredictably, making them a challenging source of food for Goeldi's monkeys.

Fungi are renowned for their poisons to deter animals from feeding on them: even today humans die from eating poisonous fungi. A natural consequence of this is the virtual absence of obligate