. Ecological and behavioural evidence for the systematic status of New Zealand oystercatchers : (Charadriiformes: Haematopodidae) . Fig. 5. Breeding dispersion of mainland New Zealand species of oystercatcher. Breeding records of H. unicolor (all colour phases lumped) are shown by open circles; those of H. ostralegus finschi are shown by black dots. 18

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