Spanish ibex
Among the 30 species of mammals living in the park are great number of deer, Spanish ibex ("Capra pyrenaica") and wild boars ("Sus scrofa"), as well as important populations of mouflon ("Ovis aries orientalis"), a wild sheep, and fallow deer ("Dama dama"). Except for the Spanish ibex, these were introduced for hunting, and have caused some pressure on the native species. Wolves were also re-introduced in recent decades.