At the Nyaru Menteng centre in Kalimantan, sixteen baby orangutans have been put into isolation, suffering infections from prolonged exposure to the thick, yellow smoke suffocating Indonesia's half of Borneo island.
A devoted carer tries to entertain the youngsters with toys and games as the infants recover from high fevers and serious coughs.
In another enclosure, several orangutans lie about listlessly, too exhausted to move after days hunting for food and water as fires relentlessly encroached on their forest homelands, forcing them to flee.