Where Horses Run Wild

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A roundup in the desert outside of Rock Springs, Wyo. For decades, the Bureau of Land Management has relied on a strategy of rounding up excess wild horses with helicopters and storing them in private ranches and feedlots. But the system is out of space and money.

Michael Friberg for The New York Times

Where Horses Run Wild

A growing number of wild horses in the Western United States pose a threat to ranchers and raise questions about how to control them.