One of the mysteries of the English language finally explained.
A North American wren of the genus Thryothorus; especially the Carolina wren, T. ludovicianus.
Mid 19th century; earliest use found in Thomas Nuttall (1786–1859), botanist. From mocking + wren, so called from its habit of mimicking the calls of other birds.
mocking wren/ˈmɒkɪŋ ˌrɛn/
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