What is "mocking wren"

Mocking \Mock"ing\, a. Imitating, esp. in derision, or so as to cause derision; mimicking; derisive.

Mocking thrush (Zo["o]l.), any species of the genus Harporhynchus, as the brown thrush ( Harporhynchus rufus).

Mocking wren (Zo["o]l.), any American wren of the genus Thryothorus, esp. Thryothorus Ludovicianus.