Video footage showing sea urchin response to the alarm cues of an injured conspecific. The cue (inserted in a plastic container with a white lid) was added after 20 minutes and filming continued for a further 40 minutes to monitor any behavioural response.
Video S2
Video footage showing sea urchin response to an empty bait pot. The bait pot, (with a white lid) was added after 20 minutes and filming continued for a further 40 minutes to monitor any behavioural response.