summary: AI analyzed the acoustic signatures of 7,414 pig calls recorded from more than 400 animals, and correctly classified 92% of the calls as positive or negative emotions.<p>research paper for those who seek more details:
<a href="https://www.nature.com/articles/s41598-022-07174-8" rel="nofollow">https://www.nature.com/articles/s41598-022-07174-8</a>