https://en.wikipedia.org/wiki/Yawn https://en.wikipedia.org/wiki/Yawn Not mentioned in the Wikipedia article, but in a referenced article [2]: "Another puzzlin

https://en.wikipedia.org/wiki/Yawn https://en.wikipedia.org/wiki/Yawn Not mentioned in the Wikipedia article, but in a referenced article [2]: "Another puzzling phenomenon is that some male animals, men included, yawn in association with penile erection" [2] https://www.nbcnews.com/id/wbna3076713 https://www.nbcnews.com/id/wbna3076713