Just how persistent predators are likely to be depends on how hard they have to compete for food and water outside the fenced
When Pat Buchanan called for longer stretches of the border to be fenced
or otherwise closed off with trenches or walls, he was dismissed as a right-wing zealot.
The size of a fence depends on the size of the field that's fenced
in, and the size of the rear of the wise man who sits on it.