Researchers writing in the journal Primates describe lemurs using millipedes to perhaps treat infections, both external and internal:
https://news.mongabay.com/2018/08/millipedes-might-soothe-itchy-lemurs-research-finds/ It would appear to be in line with news of orangutans using plants, this late 2017 story went pretty viral: Orangutans process plants into medicine, study finds https://news.mongabay.com/2017/12/orangutans-process-plants-into-medicine-study-finds/ Erik -- www.erikhoffner.com