If you thought piercings were unnatural, it's time to learn about cow holes. Many cows on cattle farms walk around with big gaping holes exposing their stomachs. It might look unnatural, but the cows are surprisingly not bothered by these holes. In fact, the holes may potentially extend their lifespans. This may look like a disturbing sight, but the gaping hole in this cow's side is actually called a fistula, and is used by scientists to test a cow's digestive process. odditycentral As the cows are fed, the fistula allows for scientists to observe how the food is digested. odditycentral...