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" Paraguay offers the most curious instance of this; for here neither cattle nor horses nor dogs have ever run wild, though they swarm southward and northward in a feral state; and Azara and Rengger have shown that this is caused by the greater number in... "
Gentleman's Magazine and Historical Review - Page 82
1883
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The Living Age, Volume 263

1909 - 844 pages
...abounded in profusion, but in Paraguay itself they had become extinct. This was caused by the existence in Paraguay of a certain fly, which lays its eggs in the navels of these animals and so produces disease and death. There do not appear to be enough parasitic insects to keep down...
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The Atlantic Monthly, Volume 18

1866 - 808 pages
...have ever run wild, though they swarm southward and northward in a feral state ; and Azara and Rengger have shown that this is caused by the greater number...must be habitually checked by some means, probably by birds. Hence if certain insectivorous birds (whose numbers are probably regulated by hawks or beasts...
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The American Journal of Science and Arts

1860 - 982 pages
...have ever run wild, though they swarm southward and northward in a feral state ; and Azara and Rengger have shown that this is caused by the greater number...must be habitually checked by some means, probably by birds. Hence, if certain insectivorous birds (whose numbers are probably regulated by hawks or beasts...
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The National Review, Volume 10

Richard Holt Hutton, Walter Bagehot - 1860 - 556 pages
...and northward, in a feral state ; and this limitation is due to the greater abundance in that area of a certain fly, which lays its eggs in the navels...these flies, numerous as they are, must be habitually kept in check by some means, probably by birds. Hence, if certain insectivorous birds (whose numbers...
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National Review, Volume 10

1860 - 564 pages
...and northward, in a feral state ; and this limitation is due to the greater abundance in that area of a certain fly, which lays its eggs in the navels...these flies, numerous as they are, must be habitually kept in check by some means, probably by birds. Hence, if certain insectivorous birds (whose numbers...
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On the Origin of Species by Means of Natural Selection; Or, The Preservation ...

Charles Darwin - 1861 - 470 pages
...ever run wild, though they swarm, southward and northward in a feral state ; and Azara and Rengger have shown that this is caused by the greater number...must be habitually checked by some means, probably by birds. Hence, if certain insectivorous birds (whose numbers are probably regulated by hawks or beasts...
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On the Origin of Species by Means of Natural Selection: Or, The Preservation ...

Charles Darwin - 1864 - 472 pages
...have ever run wild, though they swarm southward and northward in a feral state ; and Azara and Eengger have shown that this is caused by the greater number...must be habitually checked by some means, probably by birds. Hence, if certain insectivorous birds (whose numbers are probably regulated by hawks or beasts...
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On the Origin of Species by Means of Natural Selection, Or, The Preservation ...

Charles Darwin - 1866 - 668 pages
...have ever run wild, though they swarm southward and northward in a feral state ; and Azara and Rengger have shown that this is caused by the greater number...habitually checked by some means, probably by other parasitic insects. Hence, if certain insectivorous birds were to decrease in Paraguay, the parasitic...
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The American Naturalist, Volume 40

1906 - 960 pages
...northward in a feral state; and Azara and Rengger have shown that this is caused by the greater numbers, in Paraguay, of a certain fly which lays its eggs...habitually checked by some means, probably by other parasitic insects. Hence, if certain insectivorous birds were to decrease in Paraguay, the parasitic...
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Transactions of the Norfolk and Norwich Naturalists' Society, Volume 3

Norfolk and Norwich Naturalists' Society - 1884 - 820 pages
...Azara and Kengger have shown that tin's is caused by the greater number in Paraguay of a certain By which lays its eggs in the navels of these animals when first bom. The increase of these Hies, numerous as they are, must be habitually checked by some means, probably...
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