What does "mocking" mean?

Mocking: Imitating, esp. in derision, or so as to cause derision; mimicking; derisive. Mocking bird (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. -- Mocking thrush (Zoöl.), any species of the genus Harporhynchus, as the brown thrush (H. rufus). -- Mocking wren (Zoöl.), any American wren of the genus Thryothorus, esp. T. Ludovicianus.