. Elementary biology; an introduction to the science of life . Intesline Rectum Fig. 32. Digestive system in fish and in bird The main features of the digestive system are alike in all back- boned animals. In the birds there is a curious pouch connected with the gullet, — the crop, — in which food may be retained in- definitely and later either swallowed or regurgitated through the mouth. The glandular portion of the stomach, or proventriculus, is distinct from the grinding part, or gizzard

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology