This video was shot in June of 2012, near Yellowbanks reef off Santa Cruz Island, California. It shows a Sunflower Start (Pycnopodia helianthodies) chasing Sea Urchins (Strongylocentrtus spp.). You can see the escape response of the urchins as the predatory sunflower star follows them. It was shot by PISCO divers doing research in the area.

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