The more Atlantic climate of the higher areas allows the development of patches of Pyrenean oak in large areas, distributed, not without interruption, from the foot of the Sierra de Francia to Navasfrias, both in Salamanca, and into the Sierra de Malcata in Portugal. Chestnut trees are also common. In the shrubby stratum we find mountain ash, holly and small maple trees. The largest terrestrial vertebrates are found in the mountains. The highest densities of deer, wild boar and roe deer are found in these habitats.