Different yawns, different functions? Testing social hypotheses on spontaneous yawning in Theropithecus gelada.

Under the tension condition, males tended to perform YW3 with a higher frequency compared to the other two yawn types, even though the result failed to reach statistical significance (Friedman's χ 2 = 5.33, n = 9, df = 2, p = 0.070) ( Fig. 3 ) (Prediction 2b supported for males).

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