warbler

thumb|300px|A garden warbler (Sylviidae), giving its prolonged warbling song thumb|300px|A wood warbler (Phylloscopidae) thumb|300px|A magnolia warbler (Parulidae)

Various Passeriformes (perching birds) are commonly referred to as warblers. They are not necessarily closely related to one another, but share some characteristics, such as being fairly small, vocal, and insectivorous.