One of the mysteries of the English language finally explained.
1North American North American. Either of two North American herons, the large Ardea herodias (also more fully "great blue heron") and the small Egretta caerulea (also more fully "little blue heron").
2NZ NZ. The darker, slate-grey form of the eastern reef heron, Egretta sacra; = matuku.See also matuku
Mid 16th century (in an earlier sense). From blue + heron.
blue heron/ˈbluː ˌhɛrən//ˈbluː ˌhɛr(ə)n/
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