Range Description

Zosterops conspicillatus is restricted to the Northern Mariana Islands (to USA) where it occurs on the islands of Saipan, Tinian and Aguijan. It is very abundant and, on Saipan, is estimated to occur at a population density of approximately 5,950 individuals/km²³. This very high density suggests that the species exists at the maximum density allowed by resources available in the habitat and the total population is likely to number in excess of 100,000, and is perhaps as high as 200,000. A similarly sized population probably exists on Tinian, and in 2002, the population estimated for the island of Aguijan was 18,576 individuals¹⁰. It is more abundant in native limestone forest (c. 5,950 birds/km²) than in disturbed habitats (c. 4,000 birds/km²)³.