ANDREW J. MARTINEZ / SCIENCE PHOTO LIBRARY ANDREW J. MARTINEZ / SCIENCE PHOTO LIBRARY
Northern sea stars (Asterias vulgaris) feeding on mussels (Mytilus edulis). Several sea urchins (spiky, green/yellow) are also seen. The northern sea star inhabits cool coastal waters in the north-western Atlantic Ocean. It feeds mainly on bivalve molluscs such as mussels. To eat these it forces their shells open by attaching an arm to each half of the shell and pulling. It then passes digestive juices into the shell and sucks out the resulting liquid. Photographed in the Gulf of Maine, USA.
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