When I lived down in Zhuhai I befriended a group of pig farmers and would take pictures of the kids and bring them back prints every few weeks.  They were migrant workers from various surrounding provinces who couldn’t find work in the factories so reverted back to the only industry they knew.  Unfortunately they were on land adjacent to a tourist site that the city was trying to promote and were subjected to having their meager shacks razed repeatedly.  I moved away and when i returned the whole area had been bulldozed……I wish I had had the foresight to find out where they were from so that I could have found them after they were forced to leave.