The original subspecies croesus is red with green fue on top, which is an evolutionary connecting link from the green O. priamus. The upper surface is red, but the underside is green, and if one saw it flying over the treetops from below, it would appear only green. It is no exaggeration to say that Wallace, the discoverer of this species, was surprised when he caught it and opened its wings to see the red color. (Yasui)
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