Guam, Mariana Islands.
Sometimes considered conspecific with M. oceanica, M. erythrops and M. pluto. Differed from former in its much smaller size, most notably bill (effect size for males 8.68, score 3); much-reduced intensity and extent of rufous on underparts (3); metallic green vs darkish mouse-brown nape to rump in male (2); presence of pale rusty margins on wing-coverts and flight-feathers in female (2); and apparently somewhat different voice (ns). Differences from other members of this group given in relevant species accounts. Treatment of this group as four separate species supported by molecular evidence#R#R. Monotypic.
Guam, in S Mariana Is.
Previously widespread across all of Guam except for S plains, but invasion by predatory brown tree-snake (Boiga irregularis) in the 1940s saw populations begin to decline. Although still common in forest on N plateau in the 1970s, this species plummeted to extinction in 1983#R.
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