Ruminants like cows and buffaloes are seen chewing even when they are not grazing or eating anything. Why?

It is due to the process called rumination

Explanation:

the animals like cow and Buffalo seems to chew when they are not actually eating because the food is in the when intake is half chewed which is called cud and it comes back in their mouth as it contains cellulose in it. It comes back so that it can be digested in their body.

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