When orangutans were shown two photos side by side, one of a dominant flanged male (having large pads on the sides of their faces) and one of an unflanged male, they spent more time looking at the ...

When a wild orangutan in Indonesia suffered a painful wound to his cheek, he did something that stunned researchers: He chewed plant leaves known to have pain-relieving and healing properties, rubbed ...

Scientists working in Indonesia have observed an orangutan intentionally treating a wound on their face with a medicinal plant, the first time this behavior has been documented. Rakus, a male Sumatran ...