Like the caribou in the arctic, Pronghorn Antelope are migratory, traveling 170 miles back and forth over a narrow corridor of sagebrush habitat in western Wyoming from the Grand Tetons to the upper Green River basin, near Pinedale.
However, unlike caribou migrants, Pronghorn must negotiate highway traffic and barbed wire fences. These are fleet animals capable of running long distances at speeds of 60 mph, but they can’t jump fences. In fact, their typical strategy is to crawl under the fence, and they often get caught in the barbed wire.
In October 2012, a new Pronghorn overpass corridor opened that enabled the antelope to cross busy highway 191 where over a hundred antelope and mule deer were killed each year. Similar types of wildlife corridors have been built in Florida to permit the endangered Florida Panther to safely negotiate travel between protected areas there.