While I fully understand the frustration with the current situation along the US Mexico border that led to the demand for a border fence I find the idea a bit disturbing. I spent several years getting a degree in environmental biology so my first thought upon hearing about building fences is, yeah it will stop the drug traffickers and the human traffickers and various other unsavory types who currently take advantage of our open border. But it will also stop the creatures that live in the area from moving freely in the their natural habitat. Granted said habitat and its native inhabitants is already stressed by the thousands of people tramping through the desert to enter the US illegally. I suppose that if our government is unwilling to secure the US border then a border fence will just have to do. It's unfortunate that secure border may have to come at the expense of natural habitats.
Border fence plan runs into a barrier
Border Fence Project.com