What is "gnatcatcher"

n. A member of any of various species of small passerine birds in the Polioptilidae family found in North and South America, close relatives of the wrens.

n. very small North American and South American warblers

The 15 to 20 species of small passerine birds in the gnatcatcher family occur in North and South America (except for the far south and the high Andean regions). Most species of this mainly tropical and subtropical group are resident, but the blue-grey gnatcatcher of the United States and southern Canada migrates south in winter. They are close relatives of the wrens.