The focus of this presentation is the digestive system of livestock animals. The simple digestive system of swine is compared to the complex digestive system of a cow. Details of the ruminant stomach are presented, complete with a...

Middle schoolers examine the way bison eat and digest their food. Using a diagram, they follow the food from one compartment to the next. They discover that bison are ruminants and discuss why the bison need four stomachs.