What is the meaning of ruminant?

Dear Student,
Ruminants are mammals that chew cud, that is, they regurgitate partially digested solids (the cud), and chew them again. They then re-swallow the cud. This re-chewing of the cud to further break down the semi-digested food is called “ruminating.”
A ruminant begins by chewing and swallowing its food. The ingested matter is then softened within the first two chambers of the stomach, the rumen and reticulum, which communicate freely with each other (considered as a single unit, these two chambers are called the “reticulorumen”). Microbes convert the food, particularly cellulose  into less indigestible substances. The animal regurgitates the cud, and chews it again, and re-swallows it.

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