In the Northern Hemisphere, the average size of adult males and females is about , respectively, averaging 38.5 and 50.5 tonnes (42.5 and 55.5 tons),[REF] while in the Southern Hemisphere, it is ,[REF] weighing 52.5 and 63 tonnes (58 and 69.5 tons) [REF].
In the Southern Hemisphere, the longest reported for each sex were , while the longest measured by Mackintosh and Wheeler (1929) were [REF].