On a remote, windswept archipelago far south of New Zealand, a small herd of pigs lived out more than two centuries as one of the world’s most isolated feral populations. Their ancestors were left on the Auckland Islands in 1807, released by sailors as a living food store for any shipwrecked castaways who might one day wash up on those storm-battered shores.

The Auckland Islands lie about 560 km south of the New Zealand mainland, a scattering of windswept subantarctic land buffeted by some of the roughest seas in the world. Sealers…

On a remote, windswept archipelago far south of New Zealand, a small herd of pigs lived out more than two centuries as one of the world’s most isolated feral populations. Their…