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Great Egrets and the reliability of field marks

10,000 Birds

I was still telling the truth when I mentioned the four subspecies, species, taxa, forms, you name it, of the Great Egret: modesta (Asia), alba (Europe, Asia), egretta (Americas) and melanorhynchos (Africa). This is particularly interesting for birders in North America and Europe (duh!), How then could such a vagrant be identified?