The site was identified as important in 2008 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.Populations meeting IBA criteria ('trigger species'):
|Species||Current IUCN Red List Category||Season||Year(s)||Population estimate at site||IBA criteria met|
|Cassin's Auklet Ptychoramphus aleuticus||NT||breeding||1985||25,800 breeding pairs||A4ii|
|Ancient Murrelet Synthliboramphus antiquus||LC||breeding||1985||26,200 breeding pairs||A4ii|
|A4iii Species group - seabirds||n/a||breeding||1985||50,000-99,999 breeding pairs||A4iii|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2008).
|Protected area (PA)||PA designation||PA area (ha)||Relationship of PA with IBA||Overlap of PA with IBA (ha)|
|Gwaii Haanas National Park Reserve Of Canada And Haida Heritage Site||National Park||147,440||protected area overlaps with site||1,000|
|Gwaii Haanas National Marine Conservation Area Reserve & Haida Heritage Site||National Marine Conservation Area||350,000||protected area overlaps with site||0|
|Gwaii Haanas||National Marine Conservation Area Reserve||305,000||protected area overlaps with site||900|
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
|Land-use||Extent (% of site)|
BirdLife International (2023) Important Bird Area factsheet: Rankine and Langtry Islands. Downloaded from http://datazone.birdlife.org/site/factsheet/rankine-and-langtry-islands-iba-canada on 04/12/2023.