It is commonly believed that a cow has four stomachs. That is kind of correct, but technically a cow has one stomach with four different compartments. They are called rumin, reticulum, omasum, and abomasum. When the cow eats grass it travels to the first two compartments to be stored until later. When those compartments are full she will rest and cough up small amounts to chew her cud completely, it then goes to the third and fourth compartments where it is fully digested.
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