The Descent of Man, And Selection in Relation to Sex
The Descent of Man, And Selection in Relation to Sex
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p. 847.
On the FringUla leucophrySy Audubon, ibid. vol. iL p, 89. I shall have hereafter to refer to the young of certain herons and egrets being white.
*» * History of British Birds,' vol. I 1839, p. 1«9.
Digitized by Google Chap. XVI.] THE YOUNG LIKE ADULTS OF SAME SEX. 209 males during the breeding-season having been limited in their transmission to the corresponding season. When the adults have a distinct summer and winter plumage, and the young differ from both, the case is more diificult ...to understand. We may admit as probable that the young have retained an ancient state of plumage ; we can account through sexual selection for the summer or nup tial plumage of the adults, but how are we to account for their distinct winter plumage ? If we could admit that this plumage serves in all cases as a protection, its ac- quirement would be a simple affair ; but there seems no good reason for this admission. It may be suggested that the widely-different conditions of life during the winter and summer have acted ,in a direct manner on the plu- mage; this may have had some effect, but I have not much confidence in so great a difference, as we sometimes see, between the two plumages having been thus caused.
What to read after The Descent of Man, And Selection in Relation to Sex?
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To quickly assess the difficulty of the text, read a short excerpt:
p. 847.
On the FringUla leucophrySy Audubon, ibid. vol. iL p, 89. I shall have hereafter to refer to the young of certain herons and egrets being white.
*» * History of British Birds,' vol. I 1839, p. 1«9.
Digitized by Google Chap. XVI.] THE YOUNG LIKE ADULTS OF SAME SEX. 209 males during the breeding-season having been limited in their transmission to the corresponding season. When the adults have a distinct summer and winter plumage, and the young differ from both, the case is more diificult ...to understand. We may admit as probable that the young have retained an ancient state of plumage ; we can account through sexual selection for the summer or nup tial plumage of the adults, but how are we to account for their distinct winter plumage ? If we could admit that this plumage serves in all cases as a protection, its ac- quirement would be a simple affair ; but there seems no good reason for this admission. It may be suggested that the widely-different conditions of life during the winter and summer have acted ,in a direct manner on the plu- mage; this may have had some effect, but I have not much confidence in so great a difference, as we sometimes see, between the two plumages having been thus caused.
What to read after The Descent of Man, And Selection in Relation to Sex?
You can find similar books in the "Read Also" column, or choose other free books by Darwin, Charles, 1809-1882 to read onlineMoreLess
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