Dehesas host the largest number of herbivores. They are the trophic resource that sustain the black vulture, nesting in the rugged mountains. Vultures feed on the casualties that occur sporadically between cows, pigs and sheep that graze freely on the field. The dehesas are open forests of holm oak, cork and oak, created by human activity for centuries. It is the ecosystem that occupies the largest area in the Iberian West. Vast expanses fill the main and most emblematic spaces of the area.