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

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Migratory. Departs from breeding grounds in Jul, males first. Main non-breeding grounds in NW & NC Australia; passage migrant in small numbers through Korea, Japan, Hong Kong, Philippines, Micronesia and SE Asia, Sept-Dec; migrant through E China Aug-Sept and Mar-Apr, where very abundant in Yangtze Valley; arrives Australia mid-Sept to Oct. Scarcity of records between China and Non-breeding grounds suggests non- stop flights between these two zones; recorded rather rarely in Indonesia. In Australia, shows erratic movements, apparently moving in response to rainfall and temperature; occurrence in coastal areas often associated with droughts or heatwaves. Birds may depart for Asia directly from inland areas, without visiting coast; leaves NW Australia Feb-Apr, perhaps mostly mid-Mar; present C Mongolia, immediately S of breeding grounds, from late Apr.   (del Hoyo J, Elliott A, Sargatal J (eds), 1996)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1996) - www.hbw.com,
• Copyright: GROMS/BfN - www.groms.de
  
  (A digitised version of this map is published in GIS shape format on the GROMS CD).