Probable Causes of Polygamy Among Birds
Probable Causes of Polygamy Among Birds
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As we descend in the scale of being the lower orders become more strictly monogamous, till finally, among the lowest, androgy- nous forms appear, multiplying ad infinitum among the least specialized ; whereas, if we ascend from these it is noticeable how the disposition to polygamous unions is confined to the highest type of a genus or the higher genera of the sub-order.
The genesis of to-day is an epitome of the genesis of those myriad yesterdays we call the past. If this be true we have no al...ternative but in the belief that birds originally practiced monog- amy only, that ancestral forms presented no sexual disparity in size, coloration, or ornamentation, and that, in the case of the Gallinae, its representatives may have originated from an obscure- ly-tinted, plain-haunting, monogamous ancestor.
Given, then, such a starting point, we advance on the suppo- sition that sexual selection by the female, according to the stand.
1 For full discussion on these points see "Descent of Man," Chaps.
What to read after Probable Causes of Polygamy Among Birds?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Nicholson Rhoads to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As we descend in the scale of being the lower orders become more strictly monogamous, till finally, among the lowest, androgy- nous forms appear, multiplying ad infinitum among the least specialized ; whereas, if we ascend from these it is noticeable how the disposition to polygamous unions is confined to the highest type of a genus or the higher genera of the sub-order.
The genesis of to-day is an epitome of the genesis of those myriad yesterdays we call the past. If this be true we have no al...ternative but in the belief that birds originally practiced monog- amy only, that ancestral forms presented no sexual disparity in size, coloration, or ornamentation, and that, in the case of the Gallinae, its representatives may have originated from an obscure- ly-tinted, plain-haunting, monogamous ancestor.
Given, then, such a starting point, we advance on the suppo- sition that sexual selection by the female, according to the stand.
1 For full discussion on these points see "Descent of Man," Chaps.
What to read after Probable Causes of Polygamy Among Birds?
You can find similar books in the "Read Also" column, or choose other free books by Samuel Nicholson Rhoads to read onlineMoreLess
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