Although play fighting has been studied for over a century in both human and non-human animals, quantitative data on marine mammals are still scarce. Here,
Fine-tuning communication is well documented in mammalian social play which relies on a large variety of specific and non-specific signals. Facial expressions are one of
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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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