The converted footage allowed quantitative estimates to be made of the number of rollovers performed by each subject, the frequency with which rollovers occurred, the duration of the play bout, as well as the duration of the supine phase of the rollover, in which the animal was on its back with all four feet off the substrate.Moreover, the videotaped material also allowed Eshkol-Wachman Movement Notation (Golani, 1976) to be used for detailed qual-itative analysis of the contexts in which rollovers occurred. The analyses of the videotaped material were in three phases.