Video S1. Lateral-circular waving of Uca lactea. A␣male (center) beside his burrow is performing lateral-circular waving toward a burrowless female (upper left).

Video S2. Lateral-flick waving of Uca lactea. A␣male (center) is performing lateral-flick waving toward a resident male (left).

Video S3. Rapid-vertical waving of Uca lactea. A␣male (center) at the entrance to his burrow is performing rapid-vertical waving toward a burrowless male (upper right).

Video S4. Circular waving of Uca lactea. A male (center) is performing circular waving. There is no obvious audience.

ETH_1884_sm_videoS1.mov3390KSupporting info item
ETH_1884_sm_videoS2.mov260KSupporting info item
ETH_1884_sm_videoS3.mov846KSupporting info item
ETH_1884_sm_videoS4.mov2860KSupporting info item

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