Healthier, happier, and have more offspring[1], which invalidates some sibling comments. [1]: http://www.sciencemag.org/news/2018/10/male-gorillas-who-babysit-

Healthier, happier, and have more offspring[1], which invalidates some sibling comments. [1]: http://www.sciencemag.org/news/2018/10/male-gorillas-who-babysit-have-five-times-more-babies http://www.sciencemag.org/news/2018/10/male-gorillas-who-bab...