Leaf-warblers are small insectivorous birds. This was placed in the "wastebin" Old World warbler family, but is now moved into a new family Phylloscopdae. There are presently some 55 species in the genus.
These are active, constantly moving, warblers always associated with trees, though normally in fairly open woodland rather than tight plantations. They occur from top canopy to undershrubs. Most of the species are markedly territorial both in their summer and winter quarters.
Most are greenish or brownish above and off-white or yellowish below. Compared to some other warblers, their songs are very simple
Species breeding in temperate regions are usually strongly migratory.
