Ruminants are the herbivorous mammals that perform the rumination, where rumination is rechewing the cud to break it further.
What are ruminants?
Ruminants are large herbivorous mammals that are capable to acquire nutrients from plants by fermenting them in a special stomach, previous to digestion.
The process takes place in the front part of the digestive system. It typically requires the fermented ingesta to be regurgitated and chewed again.
And this process of "rechewing the food" (which is also called cud, the portion of food that returns from the stomach) is what is called rumination.
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