Do sharks sleep?



  1. 0 Votes

    Sharks don’t sleep by our definition.  Instead they have active and restful periods.  Some sharks must move constantly allowing oxygen-rich water to flow through there gills, so they can breathe.  Other sharks, like nurse sharks, have spiracles (located behind the ear) which force water across the gills.  The presence of a spiracles allows sharks to have a stationary rest.

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