A large Alvinocaris shrimp is surrounded by hundreds of smaller Opaepele shrimp that are grazing on a sulfur-coated cliff face.  The Alvinocaris shrimp is aggressive in its interactions and has been seen to attack the smaller species.

A large Alvinocaris shrimp is surrounded by hundreds of smaller Opaepele shrimp that are grazing on a sulfur-coated cliff face. The Alvinocaris shrimp is aggressive in its interactions and has been seen to attack the smaller species. Image courtesy of Submarine Ring of Fire 2014 - Ironman, NSF/NOAA, Jason, Copyright WHOI.

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