supplementary video V4 (backward tripod-like coordination)

Shown is an ant in backward locomotion. Generally, a detailed analysis of the ants’ inter-leg coordination revealed an irregular locomotion during backward walking. However, in this video we find the tendency that the legs of one tripod group are swinging more or less simultaneously. This indicates that backward tripod coordination is per se possible.本视频展示了一只正在后退行进的蚂蚁。过往针对蚂蚁足间协调机制的详细研究表明，常规情况下蚂蚁后退行走时的运动模式呈现不规则性。但在本视频中，我们观测到一类特征趋势：单组三脚架组（tripod group）的腿部几乎同步摆动。这一现象表明，后退行走时的三脚架式协调机制本身具备可行性。