Oink.

Non-domesticated pigs are variously wild boars or swine.

Timeline: Pigs roam the streets of Ann Arbor

December 15, 1947. Even Without Grease, Pig Is Slippery. Ann Arbor News. "This light-footed young Hampshire hog eluded three policemen and a number of other pursuers for more than a half hour this morning after jumping off a truck at E. Huron and Division Sts."