A juvenile Japanese macaque monkey making a snow
ball. The scene illustrates two basic features of mammals: most mammals
can maintain a constant body teperature across a broad range of environment
temperatures, and all young mammals engage in activities with no direct
payoff in terms of enhanced survival, behavior that are easily recognized
as play. The indirect benefit of play of play is that it facilitates the
maturation of the cortical systems of the brain.
By John Morgan Allman - Evolvng Brains pag. 84
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