The Common Eider is the largest duck in the Northern Hemisphere and the source of 'eiderdown' — the insulating breast feathers females pluck to line their nests. Males are spectacularly patterned in black and white with a green nape. The massive sloping bill profile is distinctive. It winters in large rafts on rocky coastlines.
Best time to see a Common Eider
The best time to see a Common Eider is January–July, when about 66% of U.S. sightings happen, based on 11,907 research-grade iNaturalist observations.
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