Step 1: Digestion in Animals:
The length of the alimentary canal is related to the type of diet.
Step 2: Herbivores:
Herbivores eat plant material rich in cellulose.
Cellulose is difficult to digest, requiring more time.
Therefore, herbivores have a much longer small intestine for effective digestion and absorption.
Step 3: Comparison:
Carnivores → shorter small intestine because meat is easier to digest.
Omnivores → medium length intestine.
Step 4: Final Answer:
The small intestine of herbivorous animals is longer.