...According to Kane they readily become feral... 
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
..." The feral dogs of La Plata have not become dumb; they are of large size, hunt single or in packs, and burrow holes for their young...
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.」
...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.」
...In the small feral P...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...In the Porto Santo feral rabbits the supra-orbital plates are generally narrower and more pointed than in our wild rabbits...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...So much variability raises a strong suspicion that these birds are domestic pigeons which have become feral...
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.」
...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.」
...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.」
...This is the only known case in which rabbits have become feral in a hot country...
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.」
...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.」
...Fowls have become feral on the Nicobar Islands (Blyth in the 'Indian Field,' 1858, p...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...Commonaround habitations; nesting locally in feral state on cliffs in westernKansas...
Harrison B Tordoff 「Check-list of the Birds of Kansas」
...A contrast to the feral dog of St...
R. Lee 「Anecdotes of the Habits and Instinct of Animals」
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