...Forbes, strange little creatures, very unlike their Spanish progenitors... 
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... It would, therefore, appear as if, during the reduction of their beaks, their wings had retained a little of that excess of length which is characteristic of their nearest relations and progenitors...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Theoriginal progenitors of our donkeys differed from the ancestral formof the horse by variations of good specific value...
Nathaniel Southgate Shaler 「Domesticated Animals」
...I have seen flocks in Mexico rangingclose to ranch houses with turkeys among them so light-coloredthat they were no doubt tame birds that hadwandered away with their wild progenitors...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...The two genera could be related,for the progenitors of Conophis possibly inhabited much of NorthAmerica in the Miocene...
John Wellman 「A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)」
...The animal knows what necessitytaught its progenitors, and it knows that only as aspontaneous impulse to do certain things...
John Burroughs 「Ways of Nature」
...Versions differ as to the number of worlds through which the progenitors of the Navaho passed...
Edward S. Curtis 「The North American Indian」
...In many places man trembles at this day, because his progenitors have trembled for thousands of years past...
Paul Henri Thiery (Baron D'Holbach) Samuel Wilkinson 「The System of Nature, Volume 2」
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