In 1996, Botswana erected an 83-mile fence along its border with Namibia. The goal was to protect domestic cattle from the highly contagious foot-and-mouth disease. Within a year, though, the barrier had snared five giraffes, one elephant, several antelopes and numerous other wild animals.
In the 20 years since, border barriers have proliferated to unprecedented levels — and become one of presidential candidate Donald Trump’s favorite talking points. But while attention has focused on the human consequences of a more bordered world, the effect on wildlife is also dramatic.
Trump has proposed sealing off the U.S.-Mexico frontier with a “great” expansion of the current wall, which spans about 650 miles of the…
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