3DEGOLIER T F, MAHONEY S A, DUKE G E. Relationships of avian cecal lengths to food habits, taxonomic position, and intestinal lengths[J]. Condor, 1999,101 (3):622- 634.
4NAIK D R. A study of the intestinal caeca of some Indian birds[D]. Varanasi, India : Banaras Hindu University, 1962.
5CLENCH M H, MATHIAS J R. The avian cecum: a review[J].Wilson Bull,1995,107(1) :93-121.
6BEZUIDENHOUT A J. The spiral fold of the caecum in the ostrieh[J].J Anat, 1993,183(4):587-592.