Among mammals, the relationship between the age at which an animal develops locomotion and the age at which it first begins to play has been widely studied. The table below lists “onset” times for locomotion and for play in eleven different species (46). Fit the data to the y = ax^b model.

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Species Homo sapiens Gorilla gorilla Felis catus Canis familiaris Rattus norvegicus Turdus merula Macaca mulatta Pan troglodytes Saimiri sciurens Cercocebus alb. Tamiasciureus hud. Locomotion Begins, x (days) 360 165 21 23 || 18 18 150 45 45 18 Play Begins, y (days) 90 105 21 26 14 28 21 105 68 75 46