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
Mail pouch a mail pouch is mail sealed against postal inspection. An example of first-class mail is a typed letter or one written by hand. It must weigh less than 13 ounces. Registered mail that would be carried in a mail pouch is mail that is within a certain length and width, regardless of thickness. Registered mail can be insured up to $25,000 for a certain premium fee. There is no limit on the value of an item sent in by registered mail. Registered mail is closely guarded and given maximum security like in handling with a locked mail pouch. Military mail