SOCIAL AND SEXUAL BEHAVIOUR I77 



Individuals keep within sight of each other and when food is found 

 and the discoverer drops down and remains feeding for some time, 

 the nearest birds quickly note this behaviour and are drawn to the 

 food; in this way the whole flock becomes concentrated upon a rich 

 supply until it is exhausted. The flock then disperses, resuming the 

 widespread search for a new supply of food, but maintaining its 

 former coherent but extended pattern. 



N 



