72 A BOOK OF BIRDS 



huge proportions. This was done by means of a curious bag which 

 ran down the front of the neck, just beneath the skin, and which 

 was filled through an opening at the base of the tongue. During the 

 time that this bag was in use the neck was drawn downwards over 

 the back, while the head was so bent that the beak rested upon the 

 wind-bag. This strange performance was apparently enacted for the 

 delight of the female. 



The Bustards, we may remark, are birds peculiar to the Old 

 World. 



