How and why the stomach of ruminant different from human stomach
The ruminant stomach is a multi-chambered organ found in ruminants (see picture at right). It is usually composed of four separate chambers and allows digestion of large quantities of plant matter that would be relatively indigestible for most other types of mammals, in particular grass and the leaves.
The upper part of this stomach is where fermentation of green foliage takes place with help from anaerobic bacteria. These bacteria allow ruminants to break down cellulose, a major component of all leaves. The slow fermentation and digestive processes that occur within this complex stomach also allow better absorption nutrients as they go on from the stomach to pass through the intestines. Having a ruminant stomach is a big advantage because it makes it so easy to find something to eat (cellulose is the most abundant organic compound on earth).