The primate play-face is homologous to the human facial display accompanying laughter. Through facial mimicry, the play-face evokes in the perceiver a similar positive emotional
Here, we provide quantitative data concerning adult and immature play distribution in geladas discussing the results in the light of their social dynamics. Sex differences
Darwin (1872), in The expression of emotions in man and animals, underlined that human facial expressions represent a shared heritage of our species with nonhuman
Play is extremely difficult to define and its benefits are not easily detectable. Due to its multifunctional nature, play represents a good opportunity to test
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A) Playing, being playful, is the healthiest way to spend your time (after feeding and housing yourself).
B) The activities that evoke playful feelings are unique to each of us.
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