The adult male then used his fingers to apply the plant juices to an injury on the right cheek. Afterwards, he pressed the chewed plant to cover the open wound like a makeshift bandage.
This is the first time that we have observed a wild animal applying a quite potent medicinal plant directly to a wound, said co-author Isabelle Laumer, a biologist at the Max Planck Institute of Animal Behaviour in Konstanz, Germany.
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