Five taxa of monkeys and the gibbon were found living in a single small forest in Malaya. Fortuitous habituation of several troops permitted observations of activities in several taxa and of interactions between the taxa. Intertaxa interactions are typically noncompetitive and occur more often than by chance with some indication of selective preferences in associations. In one extreme case members of 2 taxa formed an integrated social organization. Comparisons of response frequencies among the taxa suggest quantitative differences in frequencies of basic activity patterns between macaque and leaf eating monkey genera. These differences are in addition to species specific differences in particular response expressions.