The pack is a small, tight-knit family: an alpha male, an alpha female, and two of their daughters. Their journey to the Sierra Madre Occidental was a logistical feat of planes and rugged overland transport, but for Servín, it represented the culmination of a half-century of patient recovery. These are the smallest of North America’s grey wolves, lean animals weighing between 50 and 80 pounds, built for the steep, vertical world of the Mexican highlands.
Their presence in Santa Catarina de Tepehuanes is not an imposition of the state, but a choice made by the people who live there. In a quiet hall, the assembly of El Tarahumar y Bajíos del Tarahumar held a vote. Every hand went up in favor of the reintroduction, a rare moment of human grace toward a species that was once systematically hunted with traps and poison until only seven individuals remained in the world.
The wolves now inhabit a pre-release enclosure, a necessary pause before they are granted full freedom of the range. Biologists monitor their movements through radiotelemetry, watching as the family investigates the thickets of oak and the mountain streams. They are hunting Coues white-tailed deer and peccaries, relearning the rhythms of a landscape that their ancestors occupied for millennia.
For Servín and his colleagues from UNAM and UAM, the work is a quiet correction of a historical error. As the four wolves vanished into the shadows of the timberline, the silence of the Sierra Madre changed. It was no longer the silence of a void, but the expectant stillness of a forest that is once again whole.