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Location Northern Mariana Islands (to USA), Maug Islands
Central coordinates 145o 22.00' East  20o 2.00' North
IBA criteria A1, A2, A4i, A4ii
Area 186 ha
Altitude 0 - 227m
Year of IBA assessment 2012

Site description The proposed Maug Islands IBA is composed of three separate islets that are the remains of a collapsed volcanic cone. They are thickly vegetated mostly with grasses, low scrub, and coconut trees. The proposed IBA is uninhabited and protected by CNMI law as a Wildlife Conservation Area.

Key Biodiversity The entire three-island complex of Maug is proposed as an IBA because of its population of breeding seabirds. The three Maug Islands qualify under the A4i criteria for Brown Noddies and under the A4ii criteria for Red-tailed Tropicbirds. Micronesian Megapodes are common on Maug (Reichel and Glass, 1991). Maug is also home to Micronesian Starlings and Micronesian Honeyeaters. The islands are lushly vegetated (UOG, 1977) and are protected as part of the Northern Islands Conservation Areas (DFW, 2007d).

Non-bird biodiversity: Additional species occurring on the island include Mariana Fruit Bat.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Micronesian Scrubfowl Megapodius laperouse resident  present  A1, A2  Endangered 
Red-tailed Tropicbird Phaethon rubricauda breeding  1979-1988  200 breeding pairs  medium  A4ii  Least Concern 
Brown Noddy Anous stolidus breeding  1979-1988  6,000 breeding pairs  medium  A4i  Least Concern 
Micronesian Myzomela Myzomela rubratra resident  present  A2  Least Concern 
Micronesian Starling Aplonis opaca resident  present  A2  Least Concern 

IBA Monitoring

2007 medium not assessed not assessed

Invasive & other problematic species, genes & diseases invasive non-native/alien species/diseases - unspecified species likely in short term (within 4 years) majority/most of area/population (50-90%) slow but significant deterioration medium

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Maug Island Preserve Primeval Reserve 205 protected area contains site 186  

Protection status The IBA is formally and fully protected as a Wildlife Conservation Area by the CNMI Division of Fish and Wildlife (DFW, 2007.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Maug Islands. Downloaded from on 26/10/2016

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