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.
Catcher pouch train's catcher arm, he might miss the catcher pouch altogether. In the United Kingdom as early as 1855 an apparatus for snatching mailbags on-the-fly and delivering mail without stopping a train was in use at Slough, England. It continued in service until 1939. Catcher pouches could not be used for any other purpose. The catcher pouch was to be used only for letters (sometimes newspapers were an exception). The maximum weight of a filled catcher pouch was to be 50 pounds. The catcher pouch was to be locked and placed upside down on the mail crane no sooner than 10