Great Egrets and the reliability of field marks
10,000 Birds
JULY 26, 2015
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). Absolute field marks between two similar species describe a difference that can be judged definitely by looking at a single bird.
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