OCR Text |
Show .. 186 SEXUAL SELECTION: BIRDS. PART II. Although many young bircls belonging to vario~s orders thus give us a glimpse of the plumage of their remote progenitors, yet there are many other birds, both dull-coloured and bdght-coloured, in which the young closely resemble their parents. With such species the young of the different species cannot resemble each other more closely than do the parents; nor can they present striking resemblances to allied forms in their adult ·state. They give us but little insight into the plumage of their progenitors, excepting in so far that when the young and the old are coloured in the same general manner throughout a whole group of species, it is probable that their progenitors were similarly coloured. We may now consider the classes of cases or rules under which the differences and resemblances, between the plumage of the young and the old, of both sexes or of one sex alone, may be grouped. Rules of this kind were first enouncecl by Cuvier; but with the progress of knowledge they require some modification and amplification. This I have attempted to do, as far as the extreme complexity of the subject permits, from information derived from various sources; but a full essay on this subject by some competent ornithologist is much needed. In order to ascertain to what extent each rule prevails, I have tabulated the facts given in four great works, namely, by Macgillivray on the birds . of Britain, Audubon on those of North America, J erdon on those of India, and Gould on those of Australia. I may here premise, firstly, that the several cases or rules graduate into each other; and secondly, that when the young are said to resemble their parents, it is not meant that they are identically alike, for their colours are almost always rather less vivid, and the feathers .are softer and often of a different shape. C HAP. XVI. CLASSES OF CASES. 187 RULES OR CLASSES OF CASES. I. vVhen the adult male is more beautiful or con~ picuo.us than the adult female, the young of both sexes 111 thmr first plumage closely resemble the adult female as with the common fowl and peacock; or, as occasion~ ally occurs, they resemble her much more closely than they do the adult male. II. When the adult female js more conspicuous than the adult male, as sometimes though rarely occurs, the young of both sexes in their first plumage resemble the adult male. . III. When the adult male resembles the adult female -the Y?ung of both sexes have a peculiar :first plumag~ of the1r own, as with the robin. IV. When the adult male resembles the adult female, .tho young of both sexes in their first plumage resemble the adults, as with the kingfisher, many parrots, crows, hedge-warblers. . V. When the adults of both sexes have a distinct w_mter and summer plumage, whether or not the male ·differs from the female, the young resemble the adults o. f both. se xes m· th en· · w1· 11ter dress, or much more rarely m their summer dress; Ol' they resemble the females alone '· or the you ng may 11 ave an m. termed1. ate cha- ~·acter; or again they may differ greatly from the adults 111 both their seasonal plumages . . VI. In some few cases the young in their first plumage differ from each other according to sex· the young males resembling more or less closely the 'adult males a~ili e young f'e mal es more or less closely the adult' females. . CLASS I.-In this class, the young of both sexes Iesemble, more or less closely, the adult female whilst the ad u lt maI e d1'f fie rs, often 1·1 1 the most consp'.i cuous |