Pancreas Gizzard Esophagus 

 Kidney 1 .„^,..-....«-^ \" i ismm msim 



Cloaca 

 Large intestine 



Proventric- 

 ulus 



Gall bladder 



Intestine ^i^.. 

 Bird 



Liver 



Intestine "" ^ Stomach 



Fish 



r /^Gallbladder 



Stomach 



Esophagus 

 Mouth 



Lobster 



Digestive gland 



DIGESTIVE SYSTEMS OF BIRD, FISH AND LOBSTER 



In all chordates and arthropods (elongated, bilaterally symmetrical animals) the 

 food tube extends the length of the body from the mouth to the anus, and has vari- 

 ous glands opening into it. In birds the gullet has a curious pouch, the crop, in which 

 food may be retained indefinitely and later either swallowed into the stomach or 

 regurgitated through the mouth. The glandular portion of the stomach, the proven- 

 triculus, is distinct from the grinding portion, or gizzard. In the lobster the stomach 

 is in the head 



