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To make ogogoro, the oil palm or raffia palm tree needs to be tapped for its sap which is left to naturally ferment and then distilled.

Their report was only off by a hair; the Kongo people made remarkable textiles by beating the fibrous bark of certain trees, or weaving thread from the raffia palm.

The chimpanzees also relied on raffia palm trees as a source of sodium, but the clay does not have high sodium levels, Dr. Reynolds said.

This change in diet may be partly due to the widespread destruction of raffia palm trees that the chimps typically relied on for their minerals.

The chimps made absorbent sponges with chewed leaves and then dipped them into the sap of the raffia palm trees.