...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」
...Sasaki (1928) demonstrated the usefulnessof the precipitin technique in distinguishing species of ducksand their hybrids...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...Sonneratii, bankiva, and varius, only 12 chickens were reared, and of these only three were the product of hybrids inter se...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Two hybrids, a male and female, thus produced, were found by Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...These hybrids were at one time thought to be specifically distinct, and were named G...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The hybrids from some of the most distinct forms—for instance, from R...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In both these hybrids, the ovules, as observed by Prof...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...adami is a spontaneously produced hybrid between these two species is strongly supported by the fact that hybrids between these species and two others have spontaneously arisen...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...With respect to the extraordinary tendency which this tree exhibits to complete or partial reversion, we have seen that undoubted seminal hybrids and mongrels are similarly liable...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...137) that he has seen in India several hybrids from the pariah-dog and jackal; and between one of these hybrids and a terrier...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...vulgaris, but nothing is said of the fertility of the hybrids, and this would have been mentioned had the fact been ascertained...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...report from the Zoological Gardens it is said that hybrids from Turtur vulgaris and suratensis, and from T...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Among other domestic birds hybrids are almostunknown...
John H. Robinson 「Our Domestic Birds」
...But our domestic ducks are not, like the fowls, all of thesame species, and if individuals of different species are paired theyproduce only a few weak hybrids...
John H. Robinson 「Our Domestic Birds」
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