Video S1 from Comparative behavioural observations demonstrate the ‘cleaner’ shrimp <i>Periclimenes yucatanicus</i> engages in true symbiotic cleaning interactions

Example video from a Periclimenes yucatanicus cleaning station in Curacao, Netherlands Antilles. This P. yucatanicus signals its availability to clean by waving its long white antennae, but shows apprehension towards cleaning a posing client fish.