Pigs, also called hogs or swine, are ungulates which have been domesticated as sources of food, leather, and similar products since ancient times. More recently, they've been involved in biomedical research and treatments. Their long association with humans has led to their considerable representation in cultural milieux from paintings to proverbs. Native to Eurasia, they're collectively grouped under the genus Sus within the Suidae family. Despite pigs' reputation for gluttony, and another re… (More on Swine)