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Southern Giant Petrel
Macronectes giganteus

Along with the Northern Giant Petrel, these are the largest petrels - the SOuthern is slightly larger, with a wingspan of 180-210 cm and 86-100 cm in length. The Northern and Southern were recently split and the colour of the bill tip is the diagnostic feature: Northerns have reddish tips and Southerns greenish. They occur all round the southern oceans and closer to the Antarctic in the summer. The Southern is usually slightly heavier than the Northern and about a sixth of them can appear as the white morph.
 

Southern Giant Petrel

Southern Giant Petrel

Southern Giant Petrel

1-2: South Pacific, off Wollongong, 25/06/2011.
3: South Pacific, off Sydney, 14/08/2010.