Warblers - Old World & New World & Malagasy Warblers
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.
Sylvioid warblers - These are somewhat more closely related to each other than to other warblers. They belong to a superfamily also containing Old World babblers, Bulbuls, etc. (Follow the links to those families)
The following families are in the below gallery:
"Old World Warblers", formerly all in family Sylviidae
Leaf Warblers, now in family Phylloscopidae
Typical Bush Warblers, now in family Cettiidae
Marsh and Tree Warblers, now in family Acrocephalidae
True Warblers or Sylviid Warblers, remaining in family Sylviidae or moved into the Timaliidae (gallery on another page)
Cisticolid Warblers, family Cisticolidae
Malagasy Warblers, the newly assembled family Bernieridae
The two families of American warblers are part of another superfamily, which unites them with sparrows, buntings, finches, etc.
New World Warblers, family Parulidae
Leaf Warblers - Genus Phylloscopus
Family Cisticolidae - Tailorbirds, Cisticolas, Prinias, Neomixis and more