Butterfly bobtail squid
Butterfly bobtail squid (Sepiola birostrata). Bobtail squid are found in the Pacific and Indian Oceans. They have a symbiotic relationship with bioluminescent bacteria, in which the bacteria receive nutrients in return for hiding the squid's silhouette when viewed from below. Photographed in the Sea of Japan., Photo by ALEXANDER SEMENOV/SCIENCE PHOTO LIBRARY
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