CNMI002
Aguiguan Island and Naftan Rock


Country/territory: Northern Mariana Islands (to USA)

IBA Criteria met: A1, A2 (2007)
For more information about IBA criteria please click here

Area: 3,906 ha

Protection status:

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2007 high not assessed not assessed
For more information about IBA monitoring please click here


Site description
Aguiguan Island is an uninhabited island with patches of native forest. The island is difficult to access due to steep cliffs and visitors to the island should have permission. Naftan Rock is a small islet 1 km off the southwest coast of Aguiguan and is home to several thousand seabirds.

Key biodiversity
In 1982 Engbring et al. (1986) found that all of the CNMI’s native birds, with the exception of the Tinian Monarch, Mariana Crow, and Rota White-eye, used the small uninhabited island of Aguiguan. Craig (1999) wrote that Aguiguan was important to the Critically Endangered Golden White-Eye, which was threatened on Saipan due to the establishment of the Brown Treesnake. The entire complex of Aguiguan Island and Naftan Rock(Figure 8) is proposed as an IBA because of the presence of the Golden White-Eye and the Mariana Swiftlet (found only on Saipan and Aguiguan) and the small but consistent population of Micronesian Megapodes. Naftan Rock is a small islet 1 km off the southwest coast of Aguiguan and is home to several thousand seabirds (Table 11). Reichel (1991) reported over 600 pairs of breeding seabirds for Aguiguan, including 120 pairs of Brown Boobies and 450 pairs of Brown Noddies.

Non-bird biodiversity: Other rare, endemic, and threatened species occurring in the proposed IBA are: • Sheath-tailed Bats • Mariana Fruit Bat • Langford’s Tree Snail


Recommended citation
BirdLife International (2021) Important Bird Areas factsheet: Aguiguan Island and Naftan Rock. Downloaded from http://www.birdlife.org on 18/01/2021.