Starlings treated with low doses of FENTANYL produce songs like 'free-form jazz'

Researchers from the University of Wisconsin, Madison, found that when birds sing in flocks rather than for mating purposes it is 'gregarious' and gives them pleasure. https://www.dailymail.co.uk/sciencetech/article-8665815/Starlings-treated-low-doses-FENTANYL-produce-songs-like-free-form-jazz.html?ns_mchannel=rss&ns_campaign=1490&ito=1490