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![]() This pair of White-faced Storm-Petrel west of Porto Santo, Madeira showed significant differences in facial pattern and a grey upperparts. Note the second birds broader, white, eyebrow, smaller ear patch, and overall paler appearance. I have read that the juvenile has a greyer plumage, but there are also some variance in the adult plumages (races?). One suggestion I've gotten is that a 2'nd calendar year bird could be involved here? However feel free to send me a mail with your thoughts or experiences. Especially from those who investigate museum collections and knows the sexes or ages of this species and its races |