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

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Partially migratory and dispersive. N populations perform fairly regular migrations, hardly ever involving whole population; complex pattern in W Mediterranean, but quite well known; some records of movement between discrete populations; migration apparently by night, with birds covering about 500-600 km per night between staging sites. In warmer climes dispersive, after breeding or in response to adverse climatic conditions. Daily movements during breeding between Bonaire Venezuela, and I in search of food. The small Galapagos population is sedentary.   (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).