DIGESTIVE APPARATUS OF BIRDS. 



185 



siderable modification of form, resulting from the fact that, as 

 these animals do not masticate their food, they require some 



CEsophagus 



Ventriculus\ 

 Succenturiatusj 



Gizzard 



Pancreas 



Duodenum 



Coeca 



Large Intestine 



Ureter 



Oviduct 



Cloaca 

 Anus 



Fig. 111. DIGESTIVE APPARATUS OF FOWL. 



other means of reducing it. This means is provided for them 

 in their stomach. In the tribes whose food is of such a 

 nature as to require being moistened before it is rubbed down, 

 and especially in those which feed upon grains, the oesopha- 

 gus has a pouch-like dilatation, termed the crop or craw 

 \&g. Ill); in this it is retained, and exposed to the action 



