Play isn’t just a “convergent evolutionary feature”; it is a behavior that can be observed in mammals, aves, cephalopods, and many other clades of animals including (possibly) some crustaceans and insects. Jaak Panksepp, one of the founders (and originator of the term) of the field of affective neuroscience, identified PLAY as one of the primary emotional impulses along with SEEKING, CARE, LUST, FEAR, PANIC, and RAGE. (Panksepp consistently capitalized the terms to emphasize the primacy of them.)
Regardless of the utility that it serves, which may vary from species to species, it appears to be a fundamental element of pre-cognitive awareness, behavioral conditioning, communication, and ability to form social attachments.
Stranger