ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Bobtail squid (Sepiola sp.). Also known as dumpling squid or stubby squid, 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.
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