110 



HEREDITY AND SEX 



common, although startling differences in color are 

 rather rare. In the male the coat of fur is often darker 

 than that of the female. 



In many deer the antlers are present in the male 

 alone. In Steller's sea-lion the male is much larger 

 and stronger than the female. In a race of the Asiatic 

 elephant the male has tusks much larger than those 

 of the female. 



If we fix our attention exclusively on these remarkable 



FIG. 58. Wilson's phalarope, female (in center) , male (to right and 

 behind). A bird in winter plumage is at the left. (From Eaton, "Birds of 

 New York.") 



cases where differences between the sexes exist, we 

 get a one-sided impression of the development of 

 ornamentation and color differences in animals. We 

 must not forget that in many cases males and females 

 are both highly colored and exactly alike. We forget 

 the parrots, the cockatoos, the kingfishers, the crowned 

 pigeons, toucans, lories, and some of the starlings; 

 the " brilliant todies" and the " sluggish jacamars" 

 whose brilliant metallic golden-green breasts rival 



