Digestion a thin-walled expanded portion of the alimentary tract used for the storage of food prior to digestion. In some birds it is an expanded, muscular pouch near the gullet or throat. In adult doves and pigeons, the crop can produce crop milk to feed newly hatched birds. Certain insects may have a crop or enlarged esophagus. Herbivores have evolved cecums (or an abomasum in the case of ruminants). Ruminants have a fore-stomach with four chambers. These are the rumen, reticulum, omasum, and abomasum. In the first two chambers, the rumen and the reticulum, the food is mixed with saliva and
An Annotated Checklist of the Birds of the Oriental Region a discussion of the rationale behind the choice of English names, the systematic list (195 pages), a 17-page references list containing 814 items, and indexes of both English and scientific names. There is also a map of the region covered (supplementing the textual description within the introduction), and a list of eight excluded species. Works which used this work for their taxonomic basis include: Reviews of the checklist can be found in the following: An Annotated Checklist of the Birds of the Oriental Region An Annotated Checklist of the Birds of the Oriental Region is a 1996 softback book published