“Orangutans at the site rarely eat the plant ... intentional as he selectively treated his facial wound on his right flange, ...

Orangutans are the only great apes native to ... be intentional as he selectively treated his facial wound on his right flange, and no other body parts, with the plant juice.

but for orangutans the process is especially intriguing. Not all males develop the massive bodies, facial flanges, and throat sacs shown by Sitogos. Many retain smaller bodies long after they ...