F. W. Hutton, 1871,
Some recent authors place this species and other “masked gulls” in genus Chroicocephalus (see L. philadelphia). A recent molecular study indicated that this species was sister to L. novaehollandiae#R. Rarely hybridizes with L. novaehollandiae (race scopulinus), even where breeding alongside it (L Rotorua). Morphometric analysis links it with L. ridibundus or L. genei. Monotypic.
New Zealand, breeding on South I (mostly on the Mataura, Oreti, Aparima and Waiau rivers) and at a few sites on North I. Winters mainly on S North I and N South I, some straggling to Stewart I and Snares Is.
Food and feeding
Status and conservation
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