After an orangutan hurt his face, scientists observed him chewing a plant known to relieve pain and applying a paste made from the leaves to the injury.
Researchers heard a fight between male orangutans in the treetops of a rainforest in Sumatra, Indonesia; a day later, they spotted Rakus sporting a pink wound below his right eyelid.
Rakus feeds on Fibraurea tinctoria leaves a day after he applied the plant mesh to the wound. Saidi Agam/Suaq Project Scientists often follow an individual orangutan in the area from early morning — when it leaves its night nest — until it builds a new night nest about 12 hours later. It’s possible Rakus learned to treat his wound through “individual innovation,” Laumer said, after he accidentally touched a finger to a wound with the pain-relieving leaf juice. Or he may have learned the behavior culturally, from other orangutans, early in life.
A notable 2008 study of Bornean orangutans documented three females rubbing their bodies with a paste of chewed Dracaena cantleyi plant, which local Indigenous people use to address joint and bone pain.
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