Tailorbirds are small birds, most belonging to the genus Orthotomus. While they were often placed in the Old World warbler family Sylviidae, recent research suggests they more likely belong in the Cisticolidae and they are treated as such in Del Hoyo et al. One species, the mountain tailorbird (and therefore also its sister species rufous-headed tailorbird), is actually closer to an old world warbler genus Cettia. They occur in the Old World tropics, principally in Asia. These warblers are usually brightly colored, with green or grey upper parts and yellow white or grey under parts. They often have chestnut on the head.