. Ecological and behavioural evidence for the systematic status of New Zealand oystercatchers : (Charadriiformes: Haematopodidae) . Z^ .MWmm v:m.â ;:5» Fig. 7. Sound spectrographs of social piping vocalizations of New Zealand oyster- catchers. Spectrographs were made at a tape speed of IV2 inches per second over the frequency range 80-8000Hz. A. Pied phase//. w/Hco/or. D. H. ostralegus finschi. B. Intermediate phase H. unicolor. e. H. chathamensis. c. Black phase H. unicolor. 24

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