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shore is inappropriate habitat or cannot be utilised ( > 8 hours). Assessment of the
extent and location of suitable feeding habitat is also greatly altered by the stage of the
nesting cycle. Fig. 3a contrasts the low-demands of the incubation period with the
higher demands of chick rearing. The extensive areas requiring less than 3 hours
feeding during incubation disappear completely during chick rearing, when require 5
to 8 hours feeding are required to supply the larger food demand.