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Location Spain, Aragón
Central coordinates 0o 30.00' West  41o 40.00' North
IBA criteria C6
Area 64,500 ha
Altitude 400 - 822m
Year of IBA assessment 2000


Site description An eroded range of hills dominated by sclerophyllous scrub and dry grassland, with Juniperus and Pinus forest. The main human activity is livestock-farming.

Key Biodiversity This is an important site for breeding raptors.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Golden Eagle Aquila chrysaetos resident  1996  8-10 breeding pairs  poor  C6  Least Concern 
Booted Eagle Hieraaetus pennatus breeding  1996  10-15 breeding pairs  poor  C6  Least Concern 
Milvus migrans breeding  1996  20 breeding pairs  poor  C6  Not Recognised 
Circaetus gallicus breeding  1996  10-15 breeding pairs  poor  C6  Not Recognised 


IUCN habitat Habitat detail Extent (% of site)
Forest Native coniferous woodland  26%
Shrubland Sclerophyllous scrub, garrigue and maquis  26%
Grassland   26%
Rocky areas Inland cliffs  -
Artificial - terrestrial Arable land; Ruderal land  -

Land use

Land-use Extent (% of site)
agriculture 26%
forestry -
hunting 26%

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Alcubierre and Sigena mountain ranges. Downloaded from on 24/10/2016

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