I'm too lazy to look up the reference, but a similar thing has been happening with big horn sheep. Their horns are getting smaller as (legal) hunters have prefe

I'm too lazy to look up the reference, but a similar thing has been happening with big horn sheep. Their horns are getting smaller as (legal) hunters have preferentially killed the rams with the largest horns. EDIT: Here are a couple of links: http://www.cbc.ca/news/technology/bighorn-sheep-shrinking-due-to-hunters-study-suggests-1.2459623 http://www.cbc.ca/news/technology/bighorn-sheep-shrinking-du... https://thegatewayonline.ca/2016/01/alberta-bighorn-sheep-horns-slowly-shrinking/ https://thegatewayonline.ca/2016/01/alberta-bighorn-sheep-ho...