The Fiji Bush-warbler (Cettia ruficapilla) is a species of Old World warbler

Old World warbler

The "Old World Warblers" is the name used to describe a large group of birds formerly grouped together in the bird family Sylviidae. The family held over 400 species in over 70 genera, and were the source of much taxonomic confusion. Two families were split out initially, the cisticolas into...

 in the Sylviidae

Sylviidae

Sylviidae is a family of passerine birds that was part of an assemblage known as the Old World warblers. The family was formerly a wastebin taxon with over 400 species of bird in over 70 genera. The family was poorly defined with many characteristics shared with other families...

 family.
It is endemic to the islands of Fiji

Fiji

Fiji , officially the Republic of Fiji , is an island nation in Melanesia in the South Pacific Ocean about northeast of New Zealand's North Island...

. There are four subspecies occurring on all the main islands of the group. The species has been afforded its own genus, Vitia, in the past, but similarities of egg colour, song and morphology place it firmly within the Cettia

Cettia

Cettia 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 extends from Europe to the western Pacific...

bush-warblers.