...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」
...Sometimesthese dogs become feral, when their owners happen to be captured andimprisoned...
Edward Jesse 「Anecdotes of Dogs」
...According to Kane they readily become feral...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...From the several foregoing facts we see that reversion in the feral state gives no indication of the colour or size of the aboriginal parent-species...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In New Zealand, according to Dieffenbach, the feral cats assume a streaky grey colour like that of wild cats; and this is the case with the half-wild cats of the Scotch Highlands...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In Jamaica the feral pigs do not acquire the full size of the European wild boar, "never attaining a greater height than 20 inches at the shoulder...
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.」
...The guinea-fowl has become thoroughly feral in Jamaica and in St...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...121: an endemic South American dog seems also to have become feral in this island...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Azara quotes Buffon for the feral cattle of Africa...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...America at the period of its discovery; and more recently, about 1795, Olivier de Serres speaks of wild fowls in the forests of Guiana; these were probably feral birds...
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」
... 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」
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