It is present in cattle, buffaloes, deer, goats, camels and sheeps. The stomach of ruminant is a compound structure having following four chambers :
1. Rumen - It is the largest chamber which receives oesophagus
2. Reticulum - The rumen leads into reticulum. The reticulum has network of ridges which give it an appearance of honey comb.
3. Omasum - The omasum is a small chamber whose longitudinal folds in omasum bring mechanical breakdown of the food.
4. Abomasum.- The abomasum is the only part which has gastric glands.
Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth.