One of the mysteries of the English language finally explained.
More fully "Richmond birdwing butterfly". A birdwing butterfly, Ornithoptera richmondia, the male of which has black and iridescent green wings, native to parts of eastern Australia.
1980s. From Richmond, the name of a river and mountain range in north-eastern New South Wales + birdwing, probably after the subspecific name in scientific Latin Papilio (Ornithoptera) richmondia.
Richmond birdwing/ˌrɪtʃm(ə)nd ˈbəːdwɪŋ/
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