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The site was identified as internationally important for bird conservation in 2021 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Red-billed Tropicbird Phaethon aethereus	LC	breeding (2017)	410 individuals	A2, A4, B3a
Laysan Albatross Phoebastria immutabilis	NT	breeding (2017)	67 individuals	B1a
Townsend's Shearwater Puffinus auricularis	CR	resident (2015)	27 individuals	A1, A4, B3a
Clarion Wren Troglodytes tanneri	VU	resident (2017)	163 individuals	A1, A2
Socorro Wren Troglodytes sissonii	NT	resident (2017)	147 individuals	B1a
Socorro Mockingbird Mimus graysoni	CR	resident (2017)	21 individuals	A1, A2

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2021. The most recent assessment (2022) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Shrubland	poor (40-69%)	good (> 90%)	unfavourable
Grassland	good (> 90%)	good (> 90%)	favourable
Forest	good (> 90%)	good (> 90%)	favourable
Marine Coastal/Supratidal	good (> 90%)	good (> 90%)	favourable

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happening now	whole area/population (>90%)	very rapid to severe deterioration	very high
Climate change and severe weather	likely in long term (beyond 4 years)	whole area/population (>90%)	very rapid to severe deterioration	high
Geological events	likely in long term (beyond 4 years)	majority/most of area/population (50-90%)	very rapid to severe deterioration	high
Human intrusions and disturbance	happening now	small area/few individuals (<10%)	slow but significant deterioration	low
Transportation and service corridors	likely in short term (within 4 years)	small area/few individuals (<10%)	slow but significant deterioration	low
Residential and commercial development	likely in long term (beyond 4 years)	small area/few individuals (<10%)	no or imperceptible deterioration	low
Energy production and mining	likely in long term (beyond 4 years)	small area/few individuals (<10%)	no or imperceptible deterioration	low
Biological resource use	past (and unlikely to return) and no longer limiting	small area/few individuals (<10%)	no or imperceptible deterioration	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Whole area of site (>90%) covered by appropriate conservation designation	A comprehensive and appropriate management plan exists that aims to maintain or improve the populations of qualifying bird species	The conservation measures needed for the site are being comprehensively and effectively implemented	high

Year	Protected Area	Designation (management category)	% coverage of IBA
1994	Archipiélago de Revillagigedo	Biosphere Reserve (VI)	100
2016	Archipiélago de Revillagigedo	World Heritage Site (natural or mixed) (UA)	100
2017	Revillagigedo	Parque Nacional (IV)	97
2017	Revillagigedo	Parque Nacional (IV)	2

Habitat	% of IBA	Habitat detail
Forest	38	Tropical semi-deciduous
Grassland	-	Low, seasonally wet
Marine Coastal/Supratidal	-
Marine Neritic	-
Shrubland	-	Scrub

Tenencia de la tierra: Federal.

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Islas Revillagigedo (Mexico). Downloaded from https://datazone.birdlife.org/site/factsheet/islas-revillagigedo-iba-mexico on 03/01/2025.