Spectrogram sections of channel 0 (mic 1) of a 1-min section from four Trex recorders (R03, R11, R14 and R13, top to bottom) depicting the annotated gibbon calls including female great calls with call IDs 3 and 5. This shows that visual inspection of spectrograms is useful for call matching and that the same calls can be detected on multiple recorders ~1km apart. For more info check out the field work blog.
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