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
The Birds of America Audubon. Due in part to the Civil War, the edition was never finished; only 15 parts of the 44 part series were completed. This edition consisted of 105 plates and included none of the original text. Fewer than 100 subscriptions were sold, making this edition rarer than other early editions. Audubon's practice of obtaining his subjects has been described as:“Audubon used what we like to call today as the barrel-of-the-shotgun method...After he killed the birds, he would use a complex system of wires and strings to position the birds. Previous artists would draw the birds in a stiff position, but