Which is the ruminant having 3 chambered stomach?

There are no known ruminants with a 3-chambered stomach.

Ruminants typically have a 4-chambered stomach, consisting of:

* Rumen: The largest chamber, where microorganisms break down plant matter.

* Reticulum: A honeycomb-like chamber that traps large particles.

* Omasum: A chamber with folds that absorb water and nutrients.

* Abomasum: The "true" stomach, where digestive enzymes are secreted.

While some animals might have a stomach that seems to have fewer chambers due to structural differences, all true ruminants have a 4-chambered stomach.