Heredity and sex . Fig. 56. — Superb bird of paradise.(After Elliot.) In the white-booted humming bird (Fig. 14) twoof the tail feathers of the male are drawn out, theirshafts denuded of the vanes except at the tip wherethe feather ends in a broad expansion. In the great bird of paradise, of the Aru Islands (), the male has wonderful plumes arising from thesides that can be erected to produce a gorgeous display. SECONDARY SEXUAL CHARACTERS 109 The female is modestly clothed. In the male of thesuperb bird of. paradise (Fig. 56), the mantle behindthe neck, when erected, forms a striking or
Heredity and sex . Fig. 56. — Superb bird of paradise.(After Elliot.) In the white-booted humming bird (Fig. 14) twoof the tail feathers of the male are drawn out, theirshafts denuded of the vanes except at the tip wherethe feather ends in a broad expansion. In the great bird of paradise, of the Aru Islands (), the male has wonderful plumes arising from thesides that can be erected to produce a gorgeous display. SECONDARY SEXUAL CHARACTERS 109 The female is modestly clothed. In the male of thesuperb bird of. paradise (Fig. 56), the mantle behindthe neck, when erected, forms a striking ornament;and on the breast there is a brilliant metallic the six-shafted bird of paradise (Fig. 57) themale has on its head six feathers with wiry shafts,. Fig. 57. — Six-shafted bird of paradise.(After EUiot.) ornaments that occur in no other birds. In the kingbird of paradise there are remarkable fans at thesides of the body of the male that can be feathers of the fan are emerald-tipped. Thetwo middle feathers of the tail are drawn out into^^wires with a green web at one side of the tip. In mammals, secondary sexual differences are very 110 HEREDITY AND SEX common, although startUng differences in color arerather rare. In the male the coat of fur is often darkerthan that of the female. In many deer the antlers are present in the malealone. In Stellers sea-lion the male is much largerand stronger than the female. In a race of the Asiaticelephant the male has tusks much larger than thoseof the female. If we fix our attention exclusively on these remarkable
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
