296 



ANATOMY AND PHYSIOLOGY OF THE FOWL 



The Digestive Organs. — The digestive system is one of the 

 most complex combinations of organs in the bird's body (Fig. 142). 



ToTigue 



upper bill removed 

 E3ophn^ZLS 

 Crop 



Z^ophoffus 

 True stom&ah 

 Gizza.rci 

 Duodenum 

 SmaJl intestine 

 Caeca. 

 Rectum 

 Clos-ca. 

 Zi^er 

 Spleen 

 Ga.U bUdder 

 Pancresus 



After Wheeler 



Fig. 142.— The digestive tract. 



Teeth, though found in prehistoric birds, are wanting in birds of 

 the present time. The digestive organs of domestic fowls are as 



