Species fact sheet by Global Register of Migratory Species - www.groms.de

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Regarded as sedentary throughout much of range but is widely dispersive and possibly also migratory. No autumn or winter records in much of S Australia, but present all year in N with reduced reporting rate in winter. Some evidence for migration or dispersal on Cape York and across Torres Strait; movements also suggested between islands in Coral Sea. Recorded New Zealand all months except Jul, mostly in summer. May move in response to availability of water, e.g. from dry areas to areas of high rainfall. Flies at night; sometimes hits telegraph wires, street lights and light-houses. Vagrant to Tasmania; ephemeral populations on Lord Howe I probably derives from vagrants; vagrant to Mauritius (no details).   (del Hoyo J, Elliott A, Sargatal J (eds), 1996)

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