SEXUAL SELECTION 499 



are greatly elongated, curled, or even spirally twisted, with 

 the margins plumose," 



Fio. 47.— ParadiseaPapuana (T. W. Wood). 



In regard to color hardly anything need here be said, for 

 every one knows how splendid are the tints of many birds, 



" See my work on "The Variation of Animals and Plants Under Domestic* 

 tion," vol. 1. pp. 289, 293. 



