Common eider

Eiderdown is known for its excellent insulating qualities, and has been traded for centuries.

Every year, some of the down from the nests of common eider is harvested and sold as insulation for parkas and duvets. In moderation, this in no way interferes with the eider's reproduction.

Two to seven broods combine at sea to form a crèche, which defends a well-defined feeding area (such as a bay) on the shoreline.