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Location Spain, Castilla y León
Central coordinates 3o 30.00' West  42o 50.00' North
IBA criteria B2, C2, C6
Area 37,800 ha
Altitude 750 - 1,332m
Year of IBA assessment 2000


Site description A mountain range in the north of Burgos province with numerous cliffs and two small gorges. The slopes are covered by scrub, Pinus plantations and small Quercus and Fagus woodlands. The area is used for livestock grazing, forestry and hunting.

Key Biodiversity This is an important site for cliff-nesting birds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Egyptian Vulture Neophron percnopterus breeding  1995  15 breeding pairs  good  B2  Endangered 
Bonelli's Eagle Aquila fasciata resident  1996  2-3 breeding pairs  good  C6  Least Concern 
Circus cyaneus resident  1995  15 breeding pairs  good  B2, C6  Not Recognised 
Red-billed Chough Pyrrhocorax pyrrhocorax resident  1995  300-325 breeding pairs  good  B2, C2, C6  Least Concern 

IBA Monitoring

2007 high not assessed low
Poor - based on little, or potentially unreliable/unrepresentative, data

Energy production and mining mining and quarrying past (and unlikely to return) and no longer limiting some of area/population (10-49%) no or imperceptible deterioration low
Energy production and mining renewable energy happening now some of area/population (10-49%) slow but significant deterioration medium
Pollution excess energy - noise pollution likely in short term (within 4 years) some of area/population (10-49%) very rapid to severe deterioration high
Transportation and service corridors roads and railroads likely in short term (within 4 years) some of area/population (10-49%) very rapid to severe deterioration high

Most of site (50-90%) covered (including the most critical parts for important bird species)  No management plan exists but the management planning process has begun  Not assessed  low 


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved deciduous woodland; Mixed woodland  20%
Shrubland Heathland; Scrub  20%
Wetlands (inland) Rivers and streams  5%
Rocky areas Inland cliffs  65%
Artificial - terrestrial Arable land; Forestry plantations; Perennial crops, orchards and groves  35%

Land use

Land-use Extent (% of site)
agriculture 35%
forestry 55%
hunting 60%
not utilised 5%

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Oña and Tesla mountain ranges. Downloaded from on 28/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife