Fig. S7.

Schematic illustrating second-order features describing the state of animals in each video frame. (A) Ten ellipse parameters (five for each animal). (B) Feature 3, describing the change of the body orientation of the resident. (C) Feature 4, describing the change of the body orientation of the resident. (D) Feature 11, describing the relative angle between body orientation of the resident and the line connecting the centroids of both animals. (E) Feature 12, describing the relative angle between body orientation of the resident and the line connecting the centroids of both animals. (F) Feature 13, describing the distance between two animals.