How does the nape plumage of the male Common Eider differ from the head coloring of the male King Eider?
Answer
The Common Eider has a pale green nape patch, while the King Eider has pale blue or gray sides of the head.
The male Common Eider is marked by a pale green nape patch contrasting its white body, whereas the male King Eider is distinguished by having sides of its head that are often pale blue or gray.
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