108 HEREDITY AND SEX 



in color — the male more highly colored than the 

 female. In another native species, Maevia vittata, 

 there are two kinds of males, both colored differently 

 from the female. 



Passing over the groups of fishes and reptiles in 

 which some striking cases of differences between the 

 sexes occur, we come to the birds, where we find the 

 best examples of secondary sexual characters. 



Fig. 56. — Superb bird of paradise. 

 (After Elliot.) 



In the white-booted humming bird (Fig. 14) two 

 of the tail feathers of the male are drawn out, their 

 shafts denuded of the vanes except at the tip where 

 the feather ends in a broad expansion. 



In the great bird of paradise, of the Aru Islands (Fig. 

 13), the male has wonderful plumes arising from the 

 sides that can be erected to produce a gorgeous display. 



