SummaryWeekly counts of Giant Petrels were made at Ngauranga, Wellington Harbour, from May 1958 to May 1962. There is a definite correlation between the number of Petrels at the Ngauranga freezing works and the amount of offal available, Petrel numbers reaching a maximum from November to February coinciding with the peak period of lamb killing. Counts of Petrels were compared with the weekly whale killing figures at the Tory Channel Whaling Station, Cook Strait, indicating that Petrels were generally absent from Ngauranga during the whaling seasons. The effect of migratory movements of Giant Petrels on the numbers present at Ngauranga throughout the year is discussed.