Orangutan Night-Time Long Call Behavior: Sleep Quality Costs Associated with Vocalizations in Captive <i>Pongo</i>

<table>An example audio-spectrogram of a night-time long call produced by Azy. Notice the tail-off is long and the frequency is lower than the human range of ability to hear.</table>

Advances in Zoology

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Figure 1

Figure 1: Orangutan Night-Time Long Call Behavior: Sleep Quality Costs Associated with Vocalizations in Captive <i>Pongo</i> 

Advances in Zoology

Orangutan Night-Time Long Call Behavior: Sleep Quality Costs Associated with Vocalizations in Captive Pongo

Figure 1