Deer (Cervus elephus): This well-known, graceful mammal can reach weights of up to 265 kg and heights of 1.5 metres. It lives in woodland normally populated by beech and fir trees. The stags shed their wonderful antlers at the beginning of winter. Difficult to spot because they mainly live by night, they can be seen at dawn or dusk when they come down to drink from streams. During the rutting season, their bellows can be heard throughout the woods. Only the stags have antlers. The largest populations are in Irati and Quinto Real.

Wild Boar (Sus scrofa): this sturdy relative of the pig can reach weights of 200 kg, although males normally weigh some 100 kg. Active at twilight and during the night, the larger males are solitary beings, while the females group together with their offspring. Highly valued by hunters.

Brown bear (Ursus arctos): Weighing from 80 to 250 kg, this magnificent animal has become the symbol of wildlife protection in the Pyrenees. Nocturnal and reserved, the bear is an omnivore whose diet is mainly based on vegetables. From time to time, a sheep falls prey when the flock is scattered. Persecution at the hand of man has relegated the bear to more mountainous areas. The total bear population in the Pyrenees is estimated at 12-15. There is a male bear in the area embraced by the Consortium, “Camille”, who appears in the Valley of Roncal from time to time.

Griffon Vulture (Gyps fulvus): a carrion-eating bird of prey with a large wing span (up to 2.8 m) which thrives in the area covered by the Consortium. These vultures live in groups, nesting on shelves and in cavities on the rock faces. The largest populations appear in the ravines in the Pre-Pyrenean basins.