Game and Fish helps pronghorn cross boundaries

Copter antelopeGPS collars provide data to improve connectivity  

FLAGSTAFF, Ariz. (Dec. 23, 2015) Like some giant bird of prey, the helicopter appeared from seemingly out of nowhere and swooped down on the unsuspecting herd of pronghorn feeding on the open grassland below.

The chase was on.

In the end, despite being able to reach speeds up to 60 mph, the fastest animal in North America was no match. The net-gunner’s aim was true, the handler or “mugger” placed a GPS collar around the pronghorn’s neck, and within moments the animal was safely removed from the net and turned loose to rejoin its herd.    It was a scene that was repeated several times over the course of two days earlier this month,  just off Highway 89 about 30 miles north of Flagstaff near Wupatki National Monument. In between winter storms that hit the area 48 hours apart, the Arizona Game and Fish Department and an army of volunteers was able to capture and collar 23 pronghorn in an ongoing effort to track their movements and improve connectivity between herds.pronghorn antelope

One of Arizona’s 10 big-game species, pronghorn prefer wide-open spaces where they can use their keen vision and speed to elude danger. The problem is that those wide-open spaces aren’t so wide open anymore. One of the biggest challenges in managing pronghorn is finding ways to minimize the impact of roads, highways, railroad tracks and even fences, which act as boundaries and lead to fragmentation of habitat. Wildlife biologists say they have found genetic differences in populations of pronghorn on either side of highways that left to continue may adversely affect the populations.        

Fences, in particular, put the squeeze on pronghorn. While they have the ability to jump over a fence, they almost always prefer to crawl under. For the past several years, the department has worked with the U.S. Forest Service, the Arizona Department of Transportation, the National Park Service, local ranchers, and organizations like the Arizona Antelope Foundation to modify miles of fencing, including the cutting of the bottom strand of barbed wire and replacing it with a smooth wire 18 inches above the ground. The idea is to let the pronghorn out without getting tangled, while keeping livestock in.

"We have a diverse list of stakeholder groups and agencies that are dedicated to keeping this iconic species a part of the northern Arizona landscape," said Scott Sprague, senior research biologist for Game and Fish. “To be successful on this scale requires the support and participation of a wide variety of players. Without their commitment, the persistence of pronghorn across this landscape could be in real jeopardy.”

The recent capture effort north of Flagstaff was particularly successful with the help of the Esri-produced Collector for ArcGIS, which allows biologists and volunteers to better track observation data. With the app installed on their tablets or smartphones, crew members were able to collect, update and share pronghorn sightings while in the field.

A portion of this ongoing wildlife management project is funded through the Wildlife and Sport Fish Restoration (WSFR) program, a stalwart national funding source for state conservation and recreational opportunities.

For more information about pronghorn in Arizona, visit

Arizona, wildlife

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