Playful behavior was once considered a rare phenomenon in the animal kingdom, and yet recent evidence suggests birds, bees, apes, marsupials, lizards, turtles, crocodiles, and maybe even fish can all engage in play.
, it is often involved in responses to pain and other threats. It is also closely tied to animal vocalizations.
frameborder="0″ allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen> The behavioral changes seen in their newest experiments are apparently"massive" and strongly suggest PAG neurons are somehow related to play.
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