A shocking and disturbing video taken by an undercover investigator at a pig farm depicts the horrific extent of animal cruelty being practiced at a pork-supply company used by Walmart. Mercy For Animals released the graphic video which documents the daily animal abuse allegedly taking place at Christensen Farms in Minnesota. The video depicts hundreds of pigs packed into cages so tiny, they can barely move or even turn around. Some of the usually-social animals bite down on the bars just for something to do.