Why doesn't a mouse have a cecum?

Answer 1

Mice do have a cecum, but it is relatively small compared to that of some other mammals. The cecum is a pouch connected to the junction of the small and large intestines, and in mice, it plays a limited role in fermentation due to their diet, which primarily consists of easily digestible foods. Their digestive system has evolved to efficiently process these foods without the need for a large cecum, unlike herbivores that rely on extensive fermentation for breaking down cellulose.