GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Sea squirts (Rhopalaea sp.) on a coral reef. Sea squirts (ascidians) are sessile barrel-shaped marine animals that filter water through their body cavity, feeding on the plankton left behind. Photographed in the Lembeh Strait, North Sulawesi, Indonesia.
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