1. Gas drilling projects, such as Jonah Field, impede pronghorn migration, and new homes restrict corridors to no more than a few hundred yards wide in places.

2. In Wyoming's Grand Teton National Park a day-old pronghorn fawn snoozes away a June day in 2009.

3. Pronghorn are commonly found on the grasslands in the park.

4. But pronghorn have tremendous vision and are not fond of strangers, so Riis set up motion-triggered cameras to capture pictures like this.

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5. During the 2009 spring thaw, Wyoming pronghorn retrace their autumn steps (and splashes) to return to the Grand Teton National Park region.

6. Escaping encroaching snows farther north, pronghorn run south through Wyoming's Gros Ventre mountains on their annual fall migration in 2008.

7. Already, herds of elk, deer, and pronghorn antelope roam the grasslands, where visitors can camp, hike, and bike.

8. Loose talk sometimes mistakes the pronghorn for an antelope, but in fact it belongs to a family all its own.

9. Pronghorn, dependent on distance vision and speed to keep safe from predators, do not like willowy bottomlands, Seidler explained.

10. In the absence of cheetah, the pronghorn appears "overbuilt" for its environment today.

11. A pronghorn, one of a herd several hundred strong, stands beneath the distinctive bulk of the Grand Teton mountain.

12. The Grand Teton pronghorn are notable for the invariance of their migration path and the severity of its constriction at three critical spots, known as Trappers Point, the Red Hills, and the Funnel.

13. In the absence of the cheetah, the pronghorn appears "overbuilt" for its environment today.

14. Typical of the grassland dwellers of the continent is the American antelope, or pronghorn.

15. Typical of the gra land dwellers of the continent is the American antelope, or pronghorn.

16. Right about here, Seidler said, pointing to a gap of sage between our knoll and the houses, is where most of the pronghorn seem to cross through.

17. As at Trappers Point so here at the Funnel; incremental human activities are accumulating toward a crisis for Grand Teton's pronghorn—threatening to choke off their passageway.

18. Typical of grassland dwells of the continent is the American antelope, or pronghorn.

19. Some ranchers plan to raise the lowest fence strands so pronghorn, like these near Medicine Hat, Alberta, can more easily slip under during their winter migration.

20. Last fall and spring, biologist and photographer Joe Riis, funded by the National Geographic Society's Expeditions Council, became the first to document the entire pronghorn migration on foot.

21. The Bridger-Teton National Forest has recognized the path of the Grand Teton pronghorn, much of which passes across national forest land, as the first federally protected migration corridor.

22. In the untamed early days of the American West, pronghorn like those pictured here in Wyoming's Grand Teton National Park were plentiful and proud and moved freely.

23. Typical of the grassland dwellers of the continent is Amarican antelope, or pronghorn.

24. On a 40-acre field at the edge of town where pronghorn antelope once grazed, they built it.