Orangutan Night-Time Long Call Behavior: Sleep Quality Costs Associated with Vocalizations in Captive Pongo
Figure 5
(a) Azy experienced less nightly total sleep time and (b) sleep quality the more he invested in performing long calls. The correlation slope for total sleep time and number of night-time long calls was ; the interpolation line used a quadratic fit method. The correlation slope for sleep quality and number of night-time long calls was ; the interpolation line was linear.
