Why do sea birds have salt glands?

Sea birds have salt glands to help them excrete excess salt from the seawater they ingest while feeding. These specialized glands, located near their eyes, filter out salt from their bloodstream, allowing the birds to maintain proper hydration and electrolyte balance. This adaptation enables them to thrive in marine environments where freshwater is scarce. By expelling concentrated salt solutions, they can drink seawater without suffering from dehydration.