"鴨の羽色" (kamo no hane iro, "duck feather color") is a deep blue-green visible on the heads and necks of wild ducks. A related color, "真鴨色" (#01686d, "mallard color"), has the same meaning — though whether they are identical or distinct remains unclear. English equivalents include Teal Green (green-dominant) and Teal Blue (blue-dominant).