Hypselodoris/Risbecia tryoni
Sea slugs such as Hypselodoris tryoni, are known to exhibit trailing behaviour where up to four animals will follow one another very closely, often touching. It is not known what causes this behaviour.
http://www.seaslugforum.net/find/trailing
''Hypselodoris tryoni'' is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Similar species: Sea Slugs
By Patomarazul
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Uploaded Sep 27, 2020. Captured Nov 9, 2019 03:53 in Unnamed Road, Kobe, Weda Tengah, Kabupaten Halmahera Tengah, Maluku Utara, Indonesia.
comments (4)
3 weeks later:
"Where are we going?"
"I forgot". Posted 4 years ago