Do seag­ulls drink sea­wa­ter? And if so, how do they deal with the salt?

BBC Earth (Asia) - - Science - LV

All seabirds drink sea­wa­ter – yet birds have less ef­fi­cient kid­neys than mam­mals, and so ex­cess salt is even more toxic to them than to us. Seabirds cope with this by us­ing spe­cialised salt glands next to their eye sock­ets. These look like minia­ture kid­neys and work in a sim­i­lar way, pump­ing salt ions out of the blood­stream against the nor­mal flow of os­mo­sis. The ex­tra-salty wa­ter drips down the side of their beak.

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