...The queen, you must know, instead of being delivered of a son, was delivered of twins... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...Thither mothers of twins, widows,thieves, and slaves fly, and if they reach it are safe...
Mary H. Kingsley 「Travels in West Africa」
...The soko bringsforth at times twins...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
... It seems Bobby Burke’s soul and hers are twins, or something of that kind...
Various 「Ainslee's, Vol. 15, No. 6, July 1905」
...The female has usually onlyone young one, though sometimes twins...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...
The elephant usually brings forth, after a period of gestation offrom eighteen to twenty-two months, a single calf, though twins areoccasionally born...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...In case of twins, both horns are enlarged...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...) Ifthere are twins the natural position of the second is that of the hind feet,the heels and hocks turned upward toward the cow's tail...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...—It is very rare to have twins enterthe passages together so as to become firmly impacted...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Nonsense, an eagle fall! Had they not been stretching and exercisingtheir muscles for days? And surely the twins would succeed, with UncleSam and Aunt Samantha to encourage and urge them forth...
Edith M. Patch 「Bird Stories」
...Busy with the life Nature taught them to live, the twins grew up asUncle Sam had grown before them...
Edith M. Patch 「Bird Stories」
...Holroyd, of Withers,near Leeds, had a cow which calved twins, a bull-calf and a cow-calf...
George Vasey 「Delineations of the Ox Tribe」
...The trio were evidently amother and twins...
Various 「Heads and Tales」
...Some little time after thebirth of the twins a ceremony is performed, the object of whichclearly is to transmit the reproductive virtue of the parents tothe plantains...
Sir James George Frazer 「The Golden Bough」
...Let us further suppose that youtwo twins marry wives who are also twins born as like as two peas; andeach pair of you has a family...
Robert Marett 「Anthropology」
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