CHAPTER III 



DECORATION IN BIRDS 



The Splendid Run-bird. 



The difference in the colouring of the sexes — Evolution of Species— 

 Sun-birds — Birds of Paradise — Lyre-birds — Motmots — Puffins — 

 The methods by which Birds accjuire their plumage. 



The decoration of a bird is, as a rule, confined to the 

 adult male. The females and the young birds are soberly 

 coloured in comparison with the plumage of the old male, 

 and that this is the general rule throughout the Class Aves 

 is a well-known fact. As will be seen, however, later on, 

 there are some remarkable exceptions, in which the female 

 has the pre-eminence in ornamentation. The acquisition 

 of brighter colours by the male, usually so pronounced in 

 birds, probably depends upon sexual selection in the past, 



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