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Figure 5


Fig. 5. A dolphin approaches the response paddle, as seen from above (A,B). Underwater camera showing left eye closed (C,E) and right eye open (D,F) as the dolphin hits the response paddle during vigilance sessions. Bar graph showing observed eye closures during 120-h vigilance sessions for SAY A (G) and WEN C (H). Shaded areas indicate night time observations.





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