Many seabird species are accustomed to travelling, at times covering huge distances during migration between their breeding and wintering areas. Northern gannets, for example, leaving their colonies in Northern Europe often migrate along the Atlantic coast of France and Spain and off West-Africa. Black-legged kittiwakes can use the whole of the Northern Atlantic during the winter. Sandwich terns breeding in Northern Europe migrate mostly along the Atlantic coast as far south as Southern Africa, but can even continue their journey to the Indian Ocean.