Sonagraph recordings of engagements in males from three subgroups, involving modified and unmodified structures. Vertical scale frequencies, horizontal scale time. O. australiensis. A. Engagement 1, “loud croak”, involving two modified structures. B. Engagement 9, “loud deep croak”, involving two modified structures. C.' Engagement 29, “loud croak”, involving unmodified structures. D. Engagement 15, “faint rasping”, involving unmodified structures. O. iridescens. E. Engagement 17, “loud croaking rasp”, involving two modified structures. F. Engagement 4, “loud rasp”, involving unmodified structures. G. Engagement 3, “loud shrill croak”, involving modified plectrum. H. Engagement 29, “ faint rasping”, involving unmodified structures. O. ocellatus. I. Engagement 16, “loud rasping”, involving unmodified structures. J. Engagement 18, “loud croaking rasp”, involving two modified structures. K. Engagement 57, “loud rasping”, involving two unmodified structures. L. Engagement 6, “faint rasping”, involving two unmodified structures.
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Transactions of the Royal Society of New Zealand : Biological Sciences, Volume 11, Issue 4, 5 June 1969, Plate 1
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132Sonagraph recordings of engagements in males from three subgroups, involving modified and unmodified structures. Vertical scale frequencies, horizontal scale time. O. australiensis. A. Engagement 1, “loud croak”, involving two modified structures. B. Engagement 9, “loud deep croak”, involving two modified structures. C.' Engagement 29, “loud croak”, involving unmodified structures. D. Engagement 15, “faint rasping”, involving unmodified structures. O. iridescens. E. Engagement 17, “loud croaking rasp”, involving two modified structures. F. Engagement 4, “loud rasp”, involving unmodified structures. G. Engagement 3, “loud shrill croak”, involving modified plectrum. H. Engagement 29, “faint rasping”, involving unmodified structures. O. ocellatus. I. Engagement 16, “loud rasping”, involving unmodified structures. J. Engagement 18, “loud croaking rasp”, involving two modified structures. K. Engagement 57, “loud rasping”, involving two unmodified structures. L. Engagement 6, “faint rasping”, involving two unmodified structures. Transactions of the Royal Society of New Zealand : Biological Sciences, Volume 11, Issue 4, 5 June 1969, Plate 1
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