Always move forward, never sleep like a shark
Most sharks need to constantly swim in order to breathe and cannot sleep very long, if at all, without sinking. However certain shark species, like the nurse shark, are capable of pumping water across their gills, allowing them to rest on the ocean bottom.
Some sharks can lie on the bottom while actively pumping water over their gills, but their eyes remain open and actively follow divers.
The spiny dogfish’s spinal cord, rather than its brain, coordinates swimming, so spiny dogfish can continue to swim while sleeping.
The More You Know
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