Trembler
Tremblers are a New World group of passerine birds related to mockingbirds and New World catbirds. Like these, they are in the family Mimidae. There are 2-4 species in one genus, Cinclocerthia, which is endemic to the Lesser Antilles:
Among the living birds, they are apparently most closely related to the pearly-eyed thrasher.
Their common name comes from their peculiar behavior: if excited, they will show a much more exaggerated version of the wing-flicking also seen in other mimids such as the northern mockingbirds. The tremblers do not just flick their wings, but shake their entire bodies in a trembling motion.Footnotes