Oh, it's definitely *plausible*, even if the authors back then didn't think of it. The Southwestern US is currently undergoing a wild boar population explosion. Smithsonian magazine had a rather tinteresting article on it, including how domestic pigs devolve back to wild boar rather quickly http://www.smithsonianmag.com/science-nature/A-Plague-of-Pigs-in-Texas.html
RR
>From such a face and form as mine, the noblest sentiments sound like the
black utterances of a depraved imagination.
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