What is meant by “mutualist exploration of cellulose digestion”, a phenomenon that occurs in some mammals and insects?

What is meant by “mutualist exploration of cellulose digestion”, a phenomenon that occurs in some mammals and insects?
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Herbivorous animals eat great amounts of cellulose, a substance not digested by their digestive enzymes. In these animals regions of the digestive tube are colonized by microorganisms that digest cellulose. This mutualist ecological interaction between animals and microorganisms occurs, e.g., in horses, cows, rabbits and in some insects such as termites.
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