dolphins?
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Hmm they do play a lot, so they have enough surplus for play. I guess that's the threshold... energy+cognitive surplus beyond what can be absorbed by instinctive play.
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Fails the brain size test.
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I heard that vultures living near highways have so much free food they start inventing games to fill their leisure time.
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Indeed a game younger eagles are taught by their mothers, dive and fetch with food.
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