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Location United Kingdom, Scotland
Central coordinates 0o 51.98' West  60o 46.43' North
IBA criteria C7
Area 467 ha
Altitude 40 - 140m
Year of IBA assessment 2007

Royal Society for the Protection of Birds

Site description The site comprises herb-rich maritime heathland, the Heogs rocks and a number of disused chromite quarries. The site is important for breeding moorland birds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Whimbrel Numenius phaeopus breeding  1994  23 breeding pairs  good  C7  Least Concern 
Arctic Jaeger Stercorarius parasiticus breeding  2002  34 breeding pairs  good  C7  Least Concern 

IBA Monitoring

2007 very high near favourable low
Good - based on reliable and complete / representative data

Climate change and severe weather habitat shifting and alteration happening now whole area/population (>90%) very rapid to severe deterioration very high

Stercorarius parasiticus Arctic Jaeger 42 34 breeding pairs 81 near favourable

Whole area of site (>90%) covered by appropriate conservation designation  Unknown  Not assessed  low 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Crussa Field and The Heogs Site of Special Scientific Interest 474 is identical to site 467  


IUCN habitat Habitat detail Extent (% of site)
Shrubland Heathland  90%
Coastline   10%

Land use

Land-use Extent (% of site)
agriculture 100%

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Crussa Field and the Heogs. Downloaded from on 26/10/2016

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