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In the Foz de Arbayún is located one of the biogeographical
limits between the atlantic-Pyrenean and the Mediterranean
vegetation. The extensions of beeches and pines as well as
the colonies of Pyrenean firs predominate in the area. The
most humid areas of the Foz contain communities of lindens,
ash trees, maples, service trees, hazel trees and elms. There
are some autochthonous species that grow in the rock cracks,
such as the Saxifraga longifolia, Sarcocapnos enneaphylla,
Saponaria glutinosa and Petrocoptis hispanica. At the foot
of the gorge, and in the deepest areas grow oaks combined
with other kinds of trees (Quercus faginea and Quercus coccifera)
The fauna of the Foz de Arbayún includes the most
important colonies of birds of prey in Europe. The colony
of vultures is the first in size of Navarre, and the second
of the peninsula and the rest of Europe. There are also
lammergeyers, Egyptian vultures, different kinds of eagles
(Circaëtus gallicus, Hieraëtus pennatus and Aquila
chrysaëtus), kites (Milvus milvus, Milvuns migrans),
goshawks, eaglets (Circus pygargus and Circus cyaneus),
eagle owls, falcons, etc. The mammals are represented by
wild boars and roe deers.
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