...It is probable that, but for powder and shot, thedomestic goose of Europe, by occasionally takingto a feral life in thinly-settled countries, wouldere this have become widely distributed over theearth... 
W. H. Hudson 「Birds and Man」
...In Cuba the feral dogs are described by Poeppig as nearly all mouse-coloured, with short ears and light-blue eyes...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Smith says that the feral dogs are very large, like greyhounds, of a uniform pale blue-ash, with small ears, and large light-brown eyes...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The conditions of life in Paraguay appear not to be highly favourable to the cat, for, though they have run half-wild, they do not become thoroughly feral, like so many other European animals...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...The three Porto Santo feral rabbits (Nos...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Another and rather more distinct form is either truly wild or has become feral on the cliffs of England, and was doubtfully named by Mr...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Thirdly, these supposed species having nowhere become feral...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...This small change is worth notice on account of the often-repeated statement that all feral animals invariably revert in every character to their original type...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...For the truly feral pigs of Jamaica, see Gosse's 'Sojourn in Jamaica,' 1851, p...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
... With respect to feral pigeons—for Juan Fernandez, see Bertero in 'Annal...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...For the feral hybrids of the common and musk-ducks, see Audubon's 'American Ornithology,' and Selys-Longchamp's 'Hybrides dans la Famille des Anatides...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Rock Pigeons of the same type, however, are found inmany other parts of the Old World and, whether wild or feral, areplainly all from the same original stock...
John H. Robinson 「Our Domestic Birds」
...Furthermore, they are all comparatively large, and if they ever become feral in England, it will not be for many years to come...
W. H. Hudson 「Birds in Town and Village」
..."Pigeons" now are feral around towns and farms, andcliffsides in the west, and are locally common permanent residentsthroughout the State...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Commonaround habitations; nesting locally in feral state on cliffs in westernKansas...
Harrison B Tordoff 「Check-list of the Birds of Kansas」
...They are equal to mastiffs in strength; and Colonel Smithconsiders them as the feral dogs of St...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
...So equipped, they could travel with afair degree of precision toward the mountains some hundred miles onthe other side of a steaming forest, a-crawl with feral life, and hotwith blood-lust...
Various 「Astounding Stories of Super-Science, August 1930」
... feral emotion was addedthe unforgettable picture of a lovely face whose obvious fear wassomehow tempered by hope and confidence—in him!...
Roman Frederick Starzl 「In the Orbit of Saturn」
便利！手書き漢字入力検索