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). 



Tongue 

 upper bill removed 



c. Crop 



d Esophagus 



& J^ue stomach 



f Gizzard 



y Duodenum 



h Small intestine 



i Caeca. 



k Rectum, 



m Cloaca. 



o Ziiser 



p Spleen, 



r Gall bladder 

 P&ncree^s 



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 



