One of the mysteries of the English language finally explained.
The hooded crow, Corvus cornix.
Early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From Royston, the name of a town in Hertfordshire, south-east England, where the bird was formerly familiar as a winter visitor + crow.
Royston crow/ˈrɔɪst(ə)n ˌkrəʊ/
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