The bokikokiko, Kiritimati reed warbler or Christmas Island warbler is a species of warbler in the family Acrocephalidae. It is found only on Kiritimati and Washington Island (Kiribati).
Region
Central Pacific (Line Islands)
Typical Environment
The species is restricted to low coral atolls with dense coastal scrub, coconut plantations, and shrub thickets. On Kiritimati it occupies Scaevola and Tournefortia scrub around lagoon margins and strand vegetation. On Teraina it also uses swamp forest and thickets near freshwater wetlands. It forages from ground level up to the mid-canopy, favoring tangled cover for protection and nesting.
Altitude Range
Sea level to 10 m
Climate Zone
Tropical
Ease of Keeping
Beginner friendly: 1/5
Also known locally as the bokikokiko, this reed warbler is confined to two of Kiribati’s Line Islands. It thrives in dense thickets and coconut groves, where its loud, varied song carries surprisingly far. Habitat alteration and invasive predators pose ongoing risks, so local conservation measures are important. Despite its secrecy in foliage, it can be quite curious around people.
Temperament
solitary and territorial
Flight Pattern
short rapid wingbeats, low over vegetation
Social Behavior
Pairs defend small territories during the breeding season and build neat cup nests hidden in dense shrubs or sedges. Clutches are typically 2–3 eggs, and both parents participate in care. Outside breeding, birds may tolerate neighbors but remain tied to dense cover.
Migratory Pattern
Resident
Song Description
A loud, varied warble of clear whistles, chatters, and trills delivered from inside cover or a low perch. Calls include harsh scolds and ticking notes when alarmed.
