Twenty years of feeding records from wild Bornean orangutans revealed plant combinations that occurred together significantly more often than chance would predict. Several repeatedly paired plants have documented medicinal or pharmacological properties, with Fibraurea tinctoria emerging as one of the most prominent resources. The patterns are consistent with possible self-medication, but they do not prove that orangutans deliberately diagnose illness or combine plants for therapeutic purposes. “What makes the findings interesting is that some plant species appeared together in the orangutan diet far more often than we would expect by chance.” That observation sits at the center of a 20-year study of wild orangutans in Indonesian Borneo. The animals did not simply eat plants with known medicinal properties. They consumed certain plants together, sometimes in repeated sequences. Those patterns may point to a form of self-medication. Researchers remain cautious. They cannot say that orangutans diagnose illness as humans do, or that every plant pairing serves a medical purpose. Still, the combinations appeared too often to dismiss as random feeding. The work drew on long-term observations …