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

<table>Azy performing a stationary long call from a state of restful alertness; the vocalization was directed at conspecifics and not associated with a copulation.</table>

Advances in Zoology

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Figure 6

Figure 6: 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 6