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To determine the effects of different social conditions on play and agonistic behaviour, 25-day old golden hamsters and Mongolian gerbils were divided into four groups which differed with respect to social experience after weaning. Every day, from 26 to 61 days of age, the young hamsters were observed for numbers and durations of fight-type interactions in a 15-minute period. Every third or sixth day from 27 to 60 days of age, the gerbils were similarly tested. Seven to 14 percent of playdoi:10.14288/1.0104778 fatcat:nnzdx54rnrh7ficiyse6jj6vde