Question

the caecum is well developed in herbivores but not in why why

Answer 1

It is thought that early humans had functional vermiform appendix. It is a finger like projection which arises from caecum. It helped humans in the digestion of cellulose. However, it is vestigial organ in modern humans.

Answer 2

Caecum has a jointed appendage called the Vermiform Appendix. It contains useful bacteria like E.coli which help in digestion of food like cellulose and also in immunity. Early humans used to have raw leaves and grass which had a lot of cellulose content which was digested with the help of the Appendix. But over the period of evolution when humans started having cooked food, animals etc, the use of the Appendix started to decline as animals do not have cellulose in their body.
Hence now, only herbivores who feed on plants have a well developed caecum as compared to humans.

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