There are a number of Passeriformes (perching birds) called "warblers". They are not particularly closely related, but share some characteristics, such as being fairly small, active and insectivorous. They are mostly brownish or dull greenish in color, of small size, easier seen than heard, and hard to identify to species. To Old World birders, "warblers" are the archetypal "LBJs" ("little brown jobs"). Sylvioid "warblers" These are somewhat closer related to each other than to other "warblers".… (More on Warbler)