Tesia

The tesias are a genus, Tesia, of Old World warbler. Though once included in the large family Sylviidae, more recent research placed it within a new family, Cettiidae. The four species inhabit undergrowth of montane forest in South and Southeast Asia, where they are resident or short-range migrants. They have longish legs and appear tailless, with (seemingly) only 8 rectrices. Their simple songs are fairly loud, and their nests are typically ball-shaped. Their name is derived from Tisi, the Nepalese name for the grey-bellied tesia (Tesia cyaniventer).

==Taxonomy== The genus Tesia was erected in 1837 by the English naturalist Brian Houghton Hodgson. The name is from the Nepalese word Tisi for the grey-bellied tesia. The type species was designated as the grey-bellied tesia (Tesia cyaniventer) by the English zoologist George Robert Gray in 1847. The chestnut-headed tesia was formerly included in the genus. A molecular phylogenetic study published in 2011 found that the chestnut-headed tesia was embedded in a clade containing members of the genus Cettia. The species was therefore moved but retained the same common name.