Sea urchins use their sensory tube feet to catch drifting kelp and carry it to its mouth on the underside. Its five-part jaw efficiently cuts off pieces to eat.
Echinoderms: Urchin Time-lapse Eating Kelp
Next Generation Science Standards for this Video
Sea urchin feeding strategy: natural selection has produced urchins with powerful jaws so they can eat large quantities of kelp. Their impact on kelp forests can be great if the population is high.