Located at the at the ileo-colic junction (the end of the small intestine) and before the beginning of the large intestines are the cecal pouches. These little pouches or sacs are analogous to the cecum in mammals except that with chickens, there are two. (Makes sense, chickens proportionally eat a lot more fibrous material that needs to be broken down than mammals do.)
I write about lessons learned living with children and chickens in New Hampshire. You can follow our family’s stories at my blog: Lessons Learned From the Flock.