Organs of Nutrition 



1 27 



a forward or backward direction. Along the sides of the 

 tongue are two series of fieshy teeth, in shape exactly 

 like the poison-fangs of a rattlesnake. 



Mention must be made of the unicjue and great l\- 

 specialized tongues of Hummingbirds and Honey Creepers. 

 The outer edges of this organ are curled into two tubes, 



Fig. 100. — Side view of Flatnins<>'^ tongue, lorciMy lifted al)Ove niandihle show- 

 ing tfe.shy ieeur\ed teeth. 



W'hich are more or less split and frayed near the tip. 

 forming delicate brushes — efficient instruments either to 

 suck up nectar or to flick out insects from the heart of 

 corollas. 



The Crop 



From the back of the throat to the stomach extends 

 a tu])e, the gullet or cesophagus, through which the food 



