In the northern slope of the Cantabrian mountains, beech and oak groves of the Saja-Besaya Natural Park spread out; an important nature reserve abundant with deers, roe deers and golden eagles. The presence of Iberian wolves is not very rare, and brown bears have been sighted, thus considering this zone as an important nexus of communication between isolated populations of this plantigrade. There are also important colonies of griffon vultures. Other interesting species of animals that populate the area are: eagle owls, martens, badgers, stoats and desmans.
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