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

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N populations migrate S to Peninsular Malaysia mainly Aug-Sept, and return N in Mar; large numbers of night- flying migrants reported Aug-Dec at Fraser's Hill and Maxwell's Hill, and even on islands 60 km off W coast, with 65% being immature birds at Fraser's Hill. Ringed birds have returned to same non-breeding grounds in 2 successive seasons. A breeding visitor to many parts of range in India, but its movements there are uncertain.   (del Hoyo J, Elliott A, Sargatal J (eds), 2001)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (2001) - 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).