Eidereenden met een afwijkend verenkleed: een oproep
Sula , Volume 4 - Issue 1 p. 29- 31
Abnormal plumages in Eiders have been observed in the Dutch Wadden Sea during the last few years: a dark variety (figure 1), male-like with dark rump and wings, and a light variety (figure 2 and 3), being old female birds in male-like plumage. Further data are requested and a call for corpses to examine these abnormalities is put forward.
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