The site was identified as important in 2014 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|
|Fairy Prion Pachyptila turtur||LC||breeding||2009||35,500-100,997 breeding pairs||A4ii|
|Pycroft's Petrel Pterodroma pycrofti||VU||breeding||1940-2013||10-20 breeding pairs||A1|
|Buller's Shearwater Ardenna bulleri||VU||breeding||1981||200,000-999,999 breeding pairs||A1, A4ii|
|Australasian Gannet Morus serrator||LC||breeding||1946-2013||2,890-4,170 breeding pairs||A4ii|
|A4iii Species group - seabirds||n/a||-||-||100,000-499,999||A4iii|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2014).
|Protected area (PA)||PA designation||PA area (ha)||Relationship of PA with IBA||Overlap of PA with IBA (ha)|
|Poor Knights Islands||Nature Reserve||287||protected area overlaps with site||287|
|Poor Knights Islands||Marine Reserve||1,922||protected area is adjacent to site||0|
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
BirdLife International (2023) Important Bird Area factsheet: Poor Knights Islands. Downloaded from http://datazone.birdlife.org/site/factsheet/poor-knights-islands-iba-new-zealand on 28/09/2023.