Here is the description of Arrábida Natural Park at Unesco website:

Overlooking the Atlantic Ocean, the slopes of the Arrabida Chain are covered with the most characteristic vegetation of the region - Mediterranean maquis – a product of its particular mild climate, tempered by the Atlantic, and the relief. It is one of the most beautiful and fascinating natural regions of Mediterranean influence, and remains almost untouched in its natural equilibrium. Atong the mountain tops or in the shade of the valleys and hills there is some of the finest and most exceptional scenery in Portugal or, indeed, in the whole world, due to the privileged situation of the range as a watershed between the mast and the interior.

For many years the area now occupied by the Arrabida Natural Park was an important hunting reserve with a diversified fauna, which, amongst other species, included wolves, wild boar and deer, the latter having disappeared by the beginning of the 20c (1901).