White-chinned Petrel  Procellaria aequinoctialis ;  videograbs (20x).
   At sea near South Orkney, 22 March 2002.

   White-chinned Petrel  Procellaria aequinoctialis ;  videograbs (20x).
   At sea near South Georgia, 27 March 2002.

   White-chinned Petrel  Procellaria aequinoctialis ;  videograb (20x).
   At sea between Tristan da Cunha and St. Helena, 4 April 2002.
   Note the much larger and therefore much more obvious white chin patch on this bird.