The griffon vulture colony of the canyon Nature · Ucero, Tierras del Burgo, Soria A hundred pairs of griffon vulture breed on the limestone cliffs, one of the most important colonies on the peninsula. They share the rock faces with the golden eagle, the Egyptian vulture, the peregrine falcon and the eagle owl. Photo: Jose Ignacio Martinez Navarro (CC BY-SA 3.0 es) What to see and do in Ucero