Play behaviour of Hanuman langur (Semnopithecus entellus)

2 Summary Play is very interesting part of behaviour. Despite of broad interest it still remains insufficiently well-researched. Researchers try to describe play behaviour and explain the ontogenesis and answer one of the most important questions about function of play behaviour. These are the main topics that I deal with in my Ph.D. thesis, specifically with detail analysis of play behaviour based on data obtained from own video-recording of play behaviour of free- ranging Hanuman langurs (Semnopithecus entellus) in Bhangarh locality in northwest India. Goal of the Ph.D. thesis is to analyze several aspects of play behaviour. First goal was characteristic of play behaviour and its categories and compiling of play ethogram. Self- handicapping is in the centre of interest of my study of play behaviour. This behaviour is typical and unique for play and has not been satisfactorily explained. In first paper included in my Ph.D. thesis I analysed patterns of ethogram of play behaviour of Hanuman langurs and other monkey species. Results showed that self-handicapping patterns and pattern dissimilar to "serious" behaviour can constitute a major part of play repertoire. Play behaviour is very variable and different parts may have different function. In second publication we analyzed in detail performance and..