A Manta Ray passes over a reef, inviting a host of small fish to clean parasites and other debris off of the giant animal. Manta Rays are the largest rays in the ocean.
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The nature of fish "sleep" is an area of active research. While fish do not sleep in the same way that land mammals sleep, most fish do rest.
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Revised: 2014-01-16 | You are here: http://oceanservice.noaa.gov