. Ecological and behavioural evidence for the systematic status of New Zealand oystercatchers : (Charadriiformes: Haematopodidae) . N = 75 A 5 0 N D J F MONTHS Fig, 4. Laying date histograms for the mainland New Zealand species of oyster- catcher. The number of clutches analysed (N) is shown for each histogram. A. H. ostralegus finschi. B. Black phase H. unicolor. c. Pied and intermediate phase H. unicolor. 17

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