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Foraging habitat of snow petrel at key months in the breeding season (November = arrival and laying; February = mid-late chick-rearing) in 1992–2021. Frequency distribution of distance from breeding sites to 15% and 50% SIC contours in a November, and b February. Frequency distribution of the extent of foraging areas based on mean and maximum foraging ranges in c November, and d February. Foraging area is calculated as the total area of sea ice between 15 and 50% concentration
