Horornis
Horornis is a genus of small insectivorous songbirds which make up the core of the newly recognized family Cettiidae. They were formerly placed in the Sylviidae, which at that time was a wastebin taxon for the warbler-like Sylvioidea. The range of this genus occurs from southeast Asia throughout the western Pacific. The most recently described species is the Bougainville bush warbler from Bougainville Island.
These typical bush warblers share the lifestyle and related adaptations and apomorphies with Bradypterus, the other genus called bush warblers. However, Bradypterus is related to the grass warblers of Locustella and Megalurus and is more distant from Cettia. Both "bush warbler" genera are smallish birds well adapted to climbing among shrubbery. They are markedly long-tailed birds, at first glance somewhat reminiscent of wrens.
These are quite terrestrial birds, which live in densely vegetated habitats such as thick forest and reedbeds. They will walk away from disturbance rather than flush. The plumage similarities and skulking lifestyle makes these birds hard to see and identify.
These bush warblers tend towards rich or greyish browns above and buffish or light grey tones below. They have little patterning apart from the ubiquitous supercilium. Altogether, they appear much like the plainer species among Acrocephalus marsh warblers in coloration. Megalurid bush warblers tend to be somewhat slimmer and have a very long and pointed tail, but are otherwise very similar.
Species
This genus has been split from the genus Cettia. Cetti's warbler, the previous type species, seems close to the genus Tesia from Southeast Asia and neighboring regions. Birds in the genus Horornis, such as the famous uguisu and the brown-flanked bush warbler belong to a group that might include the aberrant broad-billed warbler. This latter species differs wildly in its gaudy colors but in habitus is a typical "bush warbler".| Image | Common Name | Scientific name | Distribution |
| Manchurian bush warbler | Horornis canturians | northeastern China. | |
| Japanese bush warbler | Horornis diphone | Japan | |
| Philippine bush warbler | Horornis seebohmi | Philippines. | |
| Palau bush warbler | Horornis annae | Palau. | |
| Shade bush warbler | Horornis parens | Solomon Islands | |
| Bougainville bush warbler | Horornis haddeni | Bougainville Island in the Solomon Islands, Papua New Guinea | |
| Fiji bush warbler | Horornis ruficapilla | Fiji. | |
| Tanimbar bush warbler | Horornis carolinae | Yamdena | - |
| Brown-flanked bush warbler | Horornis fortipes | South Asia | |
| Sunda bush warbler | Horornis vulcanius | Indonesia, Malaysia, and the Philippines. | |
| Aberrant bush warbler | Horornis flavolivacea | southern China, and the northern extremes of Myanmar and Vietnam | |
| Yellow-bellied bush warbler | Horornis acanthizoides | mainland China and Taiwan | |
| Hume's bush warbler | Horornis brunnescens | Himalayas of Nepal and India. |