HIDALGO, TX - MAY 21: A flock of birds flies over the Rio Grande on May 21, 2013 near Hidalgo, Texas. The Rio Grande Valley area, home to verdant wildlife, has also become the busiest sector for ... more 
HIDALGO, TX - MAY 21: A flock of birds flies over the Rio Grande on May 21, 2013 near Hidalgo, Texas. The Rio Grande Valley area, home to verdant wildlife, has also become the busiest sector for illegal immigration on the entire U.S.-Mexico border with more than a 50 percent increase in the last year. (Photo by John Moore/Getty Images) less 
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Getty Images | Photo By John Moore / Getty Images
Wed, May 22, 2013 9:12 AM EDT