Comment by owyn

The word "challenge" in the article title is clickbait. I guess the assumption challenged is that this measurable effect is for humans only because we are so special? Good as a headline for a non-science audience that mostly doesn't believe in evolution. It's pretty obvious that our auditory and visual systems are older than humanity as a species. I'd be surprised if the results were anything but confirming. Chickens are not going to learn English. Other species use sound to communicate and that this effect is measurable is pretty cool.