Feral pigs, however, rapidly revert to the dark and bristly form of the [[wild boar]] from which domestic pigs are derived. Feral swine in the Americas, thought to be descendant from those immigrated with the Spanish, exist in the southern United States. Estimates place the number of wild swine at as many as two million in this area.<ref>[http://texnat.tamu.edu/symposia/feral/feral-5.htm A National Perspective on Feral Swine]. Dale Rollins. Retrieved from the Texas Natural Resource Server 30 January 2008.</ref> | Feral pigs, however, rapidly revert to the dark and bristly form of the [[wild boar]] from which domestic pigs are derived. Feral swine in the Americas, thought to be descendant from those immigrated with the Spanish, exist in the southern United States. Estimates place the number of wild swine at as many as two million in this area.<ref>[http://texnat.tamu.edu/symposia/feral/feral-5.htm A National Perspective on Feral Swine]. Dale Rollins. Retrieved from the Texas Natural Resource Server 30 January 2008.</ref> |