Common Eider Pair With a name like Common Eider and the fact that it is one of the most common species found along Peaks Island’s shore one might think that this species is ‘common’ and rather uninteresting. On the contrary, this species is one of the most interesting and dynamic of all. Sometimes they form predictable, large groups – moving methodically among favorite foraging sites, and traveling out to sea for their nightly repose: Common Eider Flock Going Out to Sea Ph