Eschol-Wachman movement notation (EWMN) is a globo-graphic system, designed to express relations and changes of relation between parts of the body, with the body (i.e., body and limb segments) treated as a system of articulated axes (Golani,1976). An important feature of EWMN is that the same movements can be notated in several polar coordinate systems. The coordinates of each system are determined with reference to the environment,to the midline axis of the subject’s body, and to the next proximal or distal limb or body segment. Its primary value in the study of socialinteractions is that the movement by one animal can be describedas relative to the body of the other animal (Moran et al., 1981; and see Appendix A in Pellis et al., 2013 for a detailed outline of howthe system is used to record the behavior of two interacting ani-mals). By transforming the description of the same behavior from one coordinate system to the next, invariance in the behavior mayemerge in some coordinates but not others (Golani, 1976)