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| | I. Variation under Domestication. Breeds of the Domestic Pigeon, Their Differences and Origin. Darwin, Charles Robert. ... |
 | | Great as are the differences between the breeds of the pigeon, I am fully convinced that the common opinion of naturalists is correct, namely, that all are descended from the rock pigeon (Columba livia), including under this term several geographical races or sub-species, which differ from each other in the most trifling respects. |
 | | But birds breeding on precipices, and good fliers, are unlikely to be exterminated; and the common rock pigeon, which has the same habits with the domestic breeds, has not been exterminated even on several of the smaller British islets, or on the shores of the Mediterranean. |
 | | The rock pigeon is of a slaty-blue, with white loins; but the Indian sub-species, C. intermedia of Strickland, has this part bluish. |
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