How many compartments does a cow's stomach have?

The four compartments of a cows stomach are called the rumen, reticulum, omasum, and the abomasum. These grasses and other plants that cows eat are typically difficult to break down. That is why cows evolved with special stomachs that help them digest these rough foods. Ruminant herbivores include goats, sheep, bison, buffalo, deer, gazelles, antelopes, and giraffes.

Source: A - Z Animals