Plastics are unpalatable and consequently when gobbled by cows, they stack up in the stomach, sometimes they might get trapped with different other materials and form hard ball-like pieces. The digestive system of the cow is complex, made of "4 stomachs", making it extremely challenging for the material to pass out along with the dung, Cows may actually continue to live normally with these materials. However, problems result when there is obstruction in the system. Note that cows are indiscriminate feeders and will eat other foreign materials like nails and wires, rubber, ropes and other inorganic materials in their environment.