...The two species I have just named, while mockers of thesongs of other birds, also retain their own original music—their “naturalsong,” as an American ornithologist calls it... 
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Recently, however, Pycraft, a leading ornithologist, has proposedto base the division into sub-classes on the characters ofthe bones of the palate instead of those of the breast-bone...
John Albert Leach 「An Australian Bird Book」
...Why? No ornithologist is wiseenough to tell us, for the colour of birds is still imperfectlyunderstood...
Neltje Blanchan 「Birds Every Child Should Know」
...19 and 20) had existed as wild species, no ornithologist would have placed them in the same genus with each other or with the rock-pigeon...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...No sooner does an ornithologist lay down a lawthan some bird proceeds to break it...
Douglas Dewar 「Birds of the Indian Hills」
...There is much to interest the ornithologist in June...
Douglas Dewar 「A Bird Calendar for Northern India」
...Inthe United Provinces the only nest which the ornithologist canbe sure of finding is that of the white-backed vulture...
Douglas Dewar 「A Bird Calendar for Northern India」
...The experienced ornithologist, Montagu, suspectingthat they were male and female of the same species, undertookto clear up the matter by rearing a brood taken from thesame nest...
Rev. C. A. Johns 「British Birds in their Haunts」
...The ornithologist groups all the birds of North Americainto seventeen "Orders"; each of these including allbirds of a similar nature...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Another prominent ornithologist, Mr...
Henry W. Henshaw 「Animal Carvings from Mounds of the Mississippi Valley」
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