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

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Transequatorial migrant, moving into N Pacific (where more abundant) and N Atlantic. Large numbers first head into NW sector of respective ocean, then progressively move E following prevailing winds to reach W coasts of N America and Europe late in local summer; many thus complete wide loop before returning to breeding islands. Most S American birds may move fairly directly up and down W coasts of Americas. Some birds remain in Southern Ocean over winter.   (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).