116 



AMPHIBIANS 



tongue has two fleshy horns at the back end and is 

 attached by the front end to the floor of the mouth 

 (Figure 115). The frog can throw its sticky tongue over 

 the tip of the lower jaw and use the forked end to catch 

 insects which are then carried into the back of the mouth. 

 Two groups of little curved teeth in the roof of the 

 mouth aid in preventing the escape of the prey. The 

 food is swallowed whole. The esophagus (the tube 



Figure 115. — Diagram to Show Organs of Frog. 



connecting the mouth cavity and stomach) of the frog 

 can be stretched so that a comparative^ large animal can 

 be swallowed. There is no sharp limit between the esoph- 

 agus and the stomach, which is a long spindle-shaped sac 

 (Figure 115), larger than the rest of the digestive tube. 



The small intestine begins at the back end of the 

 stomach as a small tube which makes several turns, and 

 finally enlarges into a region called the large intestine, 

 the last part of which is termed the cloaca (cl5-a/ca) or 

 common sewer. * 



Two glands of importance belong to the digestive 



