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Nauru Reed Warbler Acrocephalus rehsei Scientific name definitions

Andrzej Dyrcz
Version: 1.0 — Published March 4, 2020
Text last updated January 1, 2006

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Originally Appeared in

HBW Alive

Field Identification

15 cm. Medium-sized reed-warbler with thin, straight bill and distinctly rounded wings. Has well-defined whitish supercilium, light rufescent head side and neck side; crown and upperparts greyish-olive, more vivid on rump and uppertail-coverts; upper­wing and tail umber-brown, remiges with faint rufescent outer edges, rectrices faintly tipped rufescent; chin and throat yellowish-white, underparts light rufescent, brightest on flanks, undertail-coverts and underwing-coverts; iris dark; bill dark horn-brown, basal half of lower mandible dull pinkish; legs lead-coloured. Sexes similar. Juvenile undescribed.

Systematics History

Has been treated as conspecific with †A. luscinius, but smaller size, shorter bill and different song justify treatment as separate species, since corroborated by genetic data (1). Monotypic.

Subspecies

Monotypic.

Distribution

Nauru I (Micronesia).

Habitat

Remnant forest on steep sides of island escarpment, gardens in coastal areas, and scrub areas.

Movement

Sedentary.

Diet and Foraging

Insects. Observed to forage in crowns of coconut palms (Cocos nucifera) in coastal areas.

Sounds and Vocal Behavior

Song, heard at any time of the day or night, described as wonderful, some notes being reminiscent of those of Song Thrush (Turdus philomelos) and others likened to notes of Eurasian Blackbird (Turdus merula).

Breeding

Probably breeds throughout year, without distinct season. Nest built 45–300 cm above ground in bush or low undergrowth, placed in forked branches of Hibiscus or lime tree (Tilia). Clutch uncertain, probably 3 eggs; no information on incubation and nestling periods.

Conservation Status

Conservation status on Birdlife NT Near Threatened

VULNERABLE. Restricted-range species: present in Nauru Secondary Area. In 1993, was found to be widely distributed throughout the island and relatively common. Population estimated at 10,000–20,000 individuals. Very small range leaves this species susceptible to chance events, such as cyclones and the introduction of alien predators.

Distribution of the Nauru Reed Warbler - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Nauru Reed Warbler

eBird and Macaulay Library

Recommended Citation

Dyrcz, A. (2020). Nauru Reed Warbler (Acrocephalus rehsei), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.narwar1.01
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