I'm disappointed by your answer, but even more so that you have more than 1 upvote. For once, reddit provided more value to me than Hacker News:

http://reddit.com/info/6haio/comments/

The comment you cite has enough made up data and weak reasoning to make the daily mail look respectable. For actual data, let us turn to the internet. The February 2007 report involving chimpanzees does lend credibility to this orangutan picture:

http://www.washingtonpost.com/wp-dyn/content/article/2007/02...

http://www.newscientist.com/article.ns?id=dn11234

I know. I'm just saying that was a lot more useful than any of the replies here. I don't know why I got downmodded.