The animal, formerly kept as a house pet, savagely attacked Binula Wickramarachchi during his walk and the visitor is recovering in Colombia Hospital in Medan.
The MailOnline reports that the Kiwi (27) was making his way through the national park of Sumatra Orangutan Observation Centre when the confrontation occurred.
It is believed that the orangutan attacked from a tree as a group of tourists approached where he was. Among Mr Wickramarachchi’s injuries was a bite on the knee
The Jakarta Post quotes the manager of the Sumatra orangutan Observation Centre, Mr Riswan Bangun as saying the injured man was now in a satisfactory condition.
The orangutan, named Minah, had escaped some time ago from being a pet and had returned to the wild.