Even so, marine mammals get a lot of salt ... and they have ways to get rid of it. Seawater is three times saltier than blood (of both terrestrial and marine invertebrates). So sea animals get rid of extra salt by producing super salty urine. Kenney explains that in some seals and sea lions, for example, their urine contains up to two and a half times more salt than seawater does and seven or eight times more salt than their blood
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