Crop (anatomy) Crop (anatomy) A crop (sometimes also called a croup or a craw, or ingluvies) is a thin-walled expanded portion of the alimentary tract used for the storage of food prior to digestion. This anatomical structure is found in a wide variety of animals. It has been found in birds, and in invertebrate animals including gastropods (snails and slugs), earthworms, leeches, and insects. Cropping is used by bees to temporarily store nectar of flowers. When bees "suck" nectar, it is stored in their crops. In a bird's digestive system, the crop is an expanded, muscular pouch near the gullet or throat.
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