258 WARFARE BETWEEN DIFFERENT SPECIES 



whether the battle be fierce or so trivial as to 

 appear to us to be more in the nature of " play,'' 

 so long as some change in the relative prospects 

 of the opponents is the result. 



For us, then, the main consideration lies in 

 the question : Is the behaviour serviceable 

 now in furthering the life of the individual ? 

 Whether the evidence which we have examined 

 affords sufficient ground for the belief that the 

 hostility is genuine and has a part to play in the 

 whole scheme of reproduction, each must judge 

 for himself. 



