I've known this for a while. I remember, as a young nerd who daydreamed about animals all day long, how I thought it was unfair that gibbons were considered "lesser apes" and shunned from the way better sounding "great apes" category. After a while, I grew to accept it. Then I saw this.
WHAT'S NOT GREAT ABOUT THAT!? I mean, we've all seen the chimp washing the cat and the orangutan peeing in his mouth, but fuck, I can do those things too! (The latter for money. Or amusement. I'm flexible.)