Guam, Northern Mariana Islands.
Formerly considered conspecific with Z. rotensis, Z. semperi and Z. hypolais, but all differ in plumage, vocalizations and behaviour, and treatment as separate species supported by DNA-DNA hybridization and analyses of mtDNA. Also, usually considered conspecific with Z. saypani, which differs from present species in its narrower supraloral line (1); green vs greyish ear-coverts (1); pale buffish-yellow vs citron-yellow underparts, although colour of vent the same (1); darker bill (ns); slightly smaller size (allow 1); and more extensive vocabulary (ns), including several high-pitched call notes unrecorded for present taxon (2) and lacking latter’s distinctly buzzy notes (2). Monotypic.
Guam, in S Mariana Is.
Historically common, but populations crashed following introduction of the brown tree-snake (Boiga irregularis) in the 1940s. Remnant populations were further reduced in 1976 when a typhoon caused considerable damage to remaining habitat. The most recent sighting was in June 1983 at Pajon Basin, in SW Guam (HBW); there have been no records since.
Food and feeding
Status and conservation
Only subscribers are able to see the bibliography. Login or Subscribe to get access to a lot of extra features!