The griffon vulture on the crags of Villar del Buey Nature · Villar del Buey, Sayago, Zamora Image of Villar del Buey, not of the place itself. The municipal district is protected at once as a UNESCO biosphere reserve, Natura 2000 Network and natural park of Arribes del Duero, and on its cliffs nest the griffon vulture, the black stork and the peregrine falcon. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Villar del Buey