Long before the desert sun has had a chance to heat the dusty prison yard, some 20 inmates at an Arizona state prison begin quietly tending horses.
The men - many with violent histories - gently manoeuvre bits into the mouths of mustangs still unaccustomed to human touch; they remove caked mud from hooves and tighten girths against bulging bellies. And the horses, which just weeks ago roamed free, mostly comply with what is asked of them.
Both the men and the horses are still learning how to live behind fences.
Prisoners participating in the Wild Horse Inmate Program train mustangs that will eventually be adopted by the U.S. Border Patrol, providing the agency with inexpensive but agile horses, and inmates with skills and insights they hope to one day carry with them from prison.