ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Mussels. Close-up of a collection of horsemussels (Modiolus modiolus, hairy) and common a blue mussel (Mytilus edulis, smooth, centre). The mussels' shells are open showing the siphons through which they draw water. Mussels filter plankton and other microscopic sea creatures out of the water as food.
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