It wasn't the same type of scrutiny as Talon's feral, maniacal look.
I'm a feral Texan.
I think what they are actually saying is that there have been no confirmed sightings of animals other than feral ones.
The domestic birds have comparatively seldom become feral, doubtless, as C. Darwin points out, from the reduction of their powers of flight in many cases.
As for the four-legged ones, they're actually feral hogs – descendents of early livestock that went wild.
Seedling plants from the cultivated vines often produce unisexual flowers, thus reverting to the feral type.
An extremely interesting collection is maintained, the variety of bird life, both feral and in captivity, being notable.
Similarly nearly all our domestic mammals except the sheep have become feral somewhere or other, whether by intentional liberation or by escape; but the smaller ones more than the larger, such as pigs, goats, dogs and cats.
A more curious case is that of the one-humped camel (Camelus dromedarius), a beast only known in domestication, and that in arid countries; yet a number of these have become feral in the Spanish marshes, where they wade about like quadrupedal flamingoes.
The house-sparrow is also feral in Argentina, some of the West Indian islands, Hawaii and the Andamans.