reef heron
noun
Either of two herons of tropical and warm temperate coastal areas, Egretta sacra, of south-east Asia and Australasia, and E. gularis, found from West Africa to India, each occurring in slate-grey and white colour phases formerly mistaken for distinct species.
Origin
Mid 19th century; earliest use found in John Gould (1804–1881), ornithologist and publisher.
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