Pigs aren't heralded for their intelligence, but swine are smarter than they seem. They're test subjects in studies that lead to life-saving discoveries. They're reliable and beloved therapy animals. Thirty to 50 of them took Twitter by storm earlier this year in an early bid for the year's best meme.


원문출처 : https://www.cnn.com/2019/10/06/us/pigs-use-tools-study-scn-trnd/index.html