Plural of eider; large sea ducks found in northern waters, known for their soft, warm feathers used in bedding.
From Old Norse 'æðarfugl' meaning 'eider duck,' the plural form 'eiders' simply adds the standard English -s suffix to indicate multiple birds.
Male eiders (called drakes) have distinctive black and white plumage that looks like a tuxedo, while females are brown and camouflaged—this color difference helps females protect eggs on rocky shores without being spotted by predators.
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