22 THE COLOUES OF ANIMALS 



Although this hypothesis has been rejected by A. R. 

 Wallace, I shall endeavour to support it by some 

 striking observations of recent date, and by as far as 

 possible answering the objections which have been 

 raised, and the hypotheses which have been believed 

 to account for the same facts. 



Display in courtship is probably the most recently 

 developed of all the various uses of colour among 

 animals, and as such, its consideration is best deferred 

 until all the others have been described. 



It must not be supposed that the colours of each 

 animal will be found to possess but a single use. 

 Thus Protective Resemblances are often supplemented 

 by Warning Colours or attitudes, which give the 

 animal an extra chance of escape after its first line of 

 defence has been broken through. It is also the 

 general rule for the colours displayed in courtship to 

 be hidden beneath protective tints when the animal 

 is at rest. 



The colours of animals may be recapitulated as 

 follows : 



I. Non-significant Colours. 



II. Significant Coloues. 



1. Colours of Direct Physiological Value, 



2. Protective and Aggressive Resemblance, 

 8. Protective and Aggressive Mimicry, 



4. Warning Colours, 



5. Colours displayed in Courtship, 



