article_snippet.sent: Scroll down for video .
article_snippet.sent: An evolutionary biologist concluded a distinctive rounded penis may have grown so long to make a distinctive rounded penis more conspicuous to potential partners, or even as a way of cooling the body down.
article_snippet.sent: Well for the testicles it's pretty straight forward. '
article_snippet.sent: But the most distinctive feature was the creatures genitalia.
article_snippet.sent: Infants can be seen in the images A and B while a juvenile is labelled C. Adult females are in the image D and adult males are seen on the far right of image E. Adults have few dark hairs on C. Adult females faces . '