In herbivores, the small intestine is very long because plant-based food, rich in cellulose, takes longer to digest. In carnivores, it is comparatively shorter as meat is easier to digest. Thus, intestine length depends on the type of diet.
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Herbivores like cows and rabbits eat plant food, which is rich in cellulose and hard to digest, so they have a longer small intestine for complete digestion and absorption. Carnivores like tigers and lions eat protein-rich, easily digestible food, so they have a shorter small intestine.