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Young animals love nothing more than play. But science is now revealing the astonishing benefits animals gain from it. This series uncovers the secrets behind their games.
2006
8.6
2008
8.3
2011
6.0
2017
2020
10.0
2018
0.0
6.4
2007
8.0
2022
2023
2005
1994
2021
2014
2019
2001
6.8
9.0