mocking : Idioms & Phrases

• (Zoöl.), a North American singing bird (Mimus polyglottos), remarkable for its exact imitations of the notes of other birds. Its back is gray; the tail and wings are blackish, with a white patch on each wing; the outer tail feathers are partly white. The name is also applied to other species of the same genus, found in Mexico, Central America, and the West Indies.

Webster 1913

• noun thrush-like American songbird able to mimic other birdsongs
  thrasher.
  

WordNet

• (Zoöl.), any species of the genus Harporhynchus, as the brown thrush (H. rufus).

Webster 1913

• (Zoöl.), any American wren of the genus Thryothorus, esp. T. Ludovicianus.

Webster 1913