...This sheep has bred freely in the Zoological Society's Gardens, andtwo hybrids have been born there from a male of this species and theCorsican mouflon, Ovis musimon... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...These hybrids, I am told,will breed again with tame variety, or with others...
Harrison Weir 「Our Cats and All About Them」
...caffra; he has seen a pair of hybrids which were quite tame and particularly attached to the lady who brought them up; and Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Fry has found that these hybrids are fertile...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...At the Zoological Gardens, however, some hybrids of the same parentage were not quite so sterile: Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Out of 500 eggs, raised from various first crosses and hybrids, between G...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Although they do not resemble the hybrids which have been raised between P...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Smith, of York, has raised similar hybrids with equally poor success...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
..." The two plants produced from the two embryos were "extremely different in appearance and character," though both resembled other hybrids of the same parentage produced at the same time...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Temminck also found the hybrids from these two species quite barren...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... These hybrids have been described by M...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Theseearly sports of the old Florida are most grown, but the Chinese velvetbean, introduced by the Department, and the hybrids developed by theFlorida Experiment Station, are important...
Florida State Live Stock Association 「Florida: An Ideal Cattle State」
...In domestication individuals ofdistinct yet similar species are sometimes mated and produce offspringcalled hybrids, but these are sterile...
John H. Robinson 「Our Domestic Birds」
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