Fig. 9.

Events and EMGs of brown tree snakes (B. irregularis, approximate L = 185 cm) while bridging 43 cm gaps based on Jorgensen and Jayne (2017). (A) Kinematic events used to partition and analyze muscle activity. The black and white arrowheads indicate the most anterior and most posterior extent, respectively, of a particular muscle from which an EMG was obtained. (B) EMGs from a snake bridging a horizontal gap with a straight trajectory. (C) Close up of EMGs from contralateral segments of the LD during the same sequence as in (B). (D) EMGs from the same snake bridging a horizontal gap with a 90° turn to the left. Note the variable extent of bilateral muscle activity for contralateral pairs of homologous muscles as well as the extent to which EMG of different ipsilateral muscle segments at a given longitudinal location are simultaneous.