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

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N populations spend non-breeding season in S of breeding range, apparently moving in connection with rainfall and high water levels of monsoon period; passes through Malay Peninsula in Sep-Nov and Feb-May. S populations (from Thailand to Philippines and Indonesia) sedentary, with influx of migrants from N in N winter. Birds of Pakistan and India also perform local movements and perhaps seasonal migrations in relation with water conditions. Recorded in Primorskiy Kray Territory, SE USSR.   (del Hoyo J, Elliott A, Sargatal J (eds), 1992)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1992) - 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).