Eider - ages

Somateria mollissima

Most observers reporting during the years 1981 to 2006 noted the age of birds seen. 61% were classified as female, 15% as immature males and 24% as adult males. Adult males were rarely seen during the winter months but were more frequently seen among passing groups. Illustrating this point, of 74 adult males recorded during the period, 62 of them migrated past Strumble Head.

Graham Rees.

(Covers records up to and including 2008).

References

MATHEW. M. 1894. The birds of Pembrokeshire and its islands, R. H. Porter.