New World Warblers

About 110 species, confined to the Americas and unrelated to the warblers of Eurasia. Small, active insectivores, most brightly patterned in spring and considerably plainer in autumn. Most migrate long distances at night. The family supplied the classic demonstration that closely related species coexist by dividing a single tree into separate feeding zones, one of the foundations of niche theory. Many are now declining sharply.