The Wild Side Border fences more effective against wildlife than illegal immigrants


For better or worse, wildlife populations pay no attention to human political borders. State lines certainly make no difference to coyotes or white-tailed deer crossing back and forth between Pennsylvania and Ohio.

Along the U.S./Mexico border, it's a different story. Walls and fences that stretch intermittently along the nearly 2,000-mile international border are intended to keep illegal immigrants out of the U.S. Based on news reports they are not terribly effective. Long, sophisticated tunnels seem easy to build. And a 2009 government report revealed that there had been 3,363 beaches of the fence just through May of that year.

But under the heading of "unintended consequences," our border fences are proving to be very effective at disrupting the movements of wildlife. The current issue of The Wildlife Professional, a publication of The Wildlife Society, reports that endangered species such as jaguars, ocelots, Sonoran pronghorn and many smaller, less glamorous species are being disturbed.

In the name of homeland security, we seem to be doing our best to destroy border wildlife populations. In 1996, the Illegal Immigration Reform and Immigrant Responsibility Act required portions of the fence to be cleared of all vegetation within 50 feet of either side of the fence. So even if animals try to find a way through the fence, they must do so without any cover.

In 2005, the Real ID Act authorized the waiver of any laws that might delay construction of barriers along the California border.Consequently, the Endangered Species Act, the National Environmental Policy Act, and the Migratory Bird Treaty Act have all been ignored in the name of national security.


The impact of waivers of environmental laws is still being studied, but it is clear that border wildlife populations are suffering. In one study using cameras and radio collars, bobcats influenced by fences moved their territories and experienced more collisions with highway traffic.



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