The central part of Tierra de Campos, known as the Northern Area of Valladolid, is a plain which human activities have transformed into a grain-producing steppe. This grain- and arable crop-producing steppe constitutes a suitable hábitat for the kinds of animals found in this landscape, ideal for their development.

The bustard rules the grain-producing steppe, measuring 0.9 m in height and a metre long, has a wingspan of two metres, and some specimens weigh more than 18 kg, making it the heaviest bird in the world that can fly.

Although the bustard is positioned as the ruler of the steppe, it is not the only protected bird that can be spotted easily; there is also the little bustard, although it is not as easy as the bustard. The lesser kestrel becomes a habitual resident when spring arrives, as does the red kite.

Birds of prey of particular interest can also be observed, such as the marsh harrier, goshawk, hen harrier, merlin, common buzzard, common hawk, and the black-shouldered kite.