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Migration and Vagrancy
The non-breeding pelagic range is poorly known. Moulting birds especially have been found in South Africa, Australia and New Zealand. The western subspecies (nominate form) has been recorded as far as the Snares Islands during moult. Vagrants of the Northern Rockhopper have been recorded on the Chatham Islands.
Conservation and Status
All three subspecies are classified by the IUCN as ‘vulnerable’. The total population is estimated at about 2,000,000 pairs but substantial declines have occurred over most of their distribution in recent years.