Lack of hand preference in wild Hanuman langurs (Presbytis Entellus) is a study that investigates the maneuverability of different tasks within a natural population of Hanuman langurs. Manual specialization is the best indicator of the strong hemispherical lateralization for which Hominids are known, clearly demonstrated by Homo sapiens which exhibits 90% right-handedness. The researchers wanted to test whether the Hanuman langur demonstrated a preference for one hand or the other. They hypothesized that Hanuman langurs preferred their right hand when performing daily tasks. For this study, researchers observed 10 randomly selected, free-ranging adult Hanuman langurs in the Siwalik Mountains of southern Nepal. Among these ten, five of the Hanuman langurs were males, the rest; female. Each of the females was carrying an unweaned baby and all members were part of a free-ranging multi-male and multi-female group. Researchers observed these primates carrying, eating, hitting, holding, idling, handling, reaching, retrieving, grooming, and social grooming. These primates were observed using focal sampling of subjects during 20-minute sessions. Focal sampling is an observational technique in which researchers focus on and observe one individual at a time. During their observations, the researchers recorded which hand the primates used to complete the specified tasks and the objects they interacted with. The results revealed a lack of hand preference among Hanuman langurs, with the exception of the Eating category. Nine of ten subjects showed no statistically significant degree of lateralization. In the Eating category, five subjects showed a preference for their right hand while four others showed a preference for their left hand. Only one female demonstrated a significant preference for learning about the life around us, particularly non-human primates. It is possible that certain social patterns of different primate communities are predominant in human social structure. This raises further questions about why these social patterns are similar. Is the reason perhaps biological? Sometimes there is no unanswered question and the only reason research studies like these are conducted is simply because we want to know how a certain species of animal works. Works Cited Mittra, ES and Fuentes, AA (1997). Lack of hand preference in wild Hanuman langurs (Presbytis entellus). American Journal Of Physical Anthropology, 103(4), 455. Nikolei, J. and Borries, C. (1997). Sex-differential behavior of immature Hanuman langurs (presbytis entellus) in Ramnagar, southern Nepal. International Journal of Primatology, 18(3), 415.