Page 192 - Demo

Chapter 8190Figure 4. Male long-call spectrogram in comparison with Temmy’s vocal response. Male long-calls have a longer total duration than Temmy’s vocalisations, but the pulses bear many resemblances in spectral and temporal pattern.In comparison to the known repertoire of orang-utans, it is noticeable that these calls bear less resemblance to these known vocalisations. It might come closest to the complex call which has also relatively long and low call units. However, the units in the complex call are produced as several short, consecutive bursts, whilst the long-call-like call of Eloise is one long burst on an exhale, followed by an audible inhale. Especially the long duration of the pulses and the total call duration of Eloise’s vocalisations make them incomparable to any of the known orangutan calls. Figure 5. Eloise’s vocalizations in comparison to the male long-call. The pulses in Eloise’s call are longer than those of the male-long call. However, the overall call structure and total call length are similar. The spectral information of the call also bears many similarities to the male long-call. Tom Roth.indd 190 08-01-2024 10:42