The orangutan's prescription
one. In 2024 a wild orangutan named Rakus chewed a vine and pressed it on his face wound, and the world noticed: an ape treating itself. The vine was Fibraurea tinctoria. In Borneo's Sebangau peat-swamp, researchers held a quieter record: 20 years of watching, 55 orangutans, 12,236 recorded meals.
two. The apes ate 202 plant species. Sixty-four of them are also Dayak medicine plants, the overlap list drawn up with two local botanists, a decade in that forest. Then a question: which foods arrive together more often than chance allows? 16,569 pairs checked. 324 broke chance.
three. The strongest pair in the archive: Fibraurea tinctoria, Rakus's vine, with a tree called Mezzettia parviflora. Not one pill, a combination. On days the basket already held Alyxia and Willughbeia, the wound vine appeared too, 62.5% of the time. As if apes wrote prescriptions, not shopping lists.
four. Orangutans are the only great ape never seen leaf-swallowing, the classic ape medicine. Maybe their medicine comes in recipes instead. The authors say candidate, not proof. Twenty years of watching says: not chance. Allen et al., Scientific Reports, May 2026.
Sources: Allen et al., Scientific Reports (2026). doi:10.1038/s41598-026-52614-4
If there's a true thing you want told small, say the word: first chapter free, $20 if it lands.