Okinawa Robin
Larvivora namiyei
Endemic resident of shady subtropical broadleaf forest understorey on the main island of Okinawa. Forages on the ground and often seen at the forest edge. Rufous-orange upperparts with grayish-white belly. Male has a black face and chest. Similar to the migratory Ryukyu Robin but male lacks the blackish flank patches and black forehead of that species. Female lacks black spotting on the chest of female Ryukyu Robin. Song is an up-and-down whistled melody. Call is a dry rattle, accompanied by wing and tail flicks.
识别特征
*Larvivora namiyei*, commonly known as the Ryukyu Robin or Namiye's Thrush, is a small passerine bird. **Size:** This species typically measures approximately 14 cm in total length. Precise wingspan and weight data, including specific figures for sexual dimorphism, are not widely published for this species in general ornithological literature. **Plumage - Adult Male:** The upperparts are a uniform olive-brown. The head, encompassing the crown, nape, and lores, is a dark greyish-brown to blackish-brown, often appearing almost black, creating a strong contrast with the body. The throat is a clean, bright white. The breast and flanks display a prominent, rich rufous-orange coloration, which transitions to clean white on the belly and undertail coverts. The tail is a distinctive rufous-chestnut. **Plumage - Adult Female:** Generally similar to the adult male but with more subdued coloration. The head is typically a browner grey, appearing less intensely dark than the male's. The rufous-orange on the breast and flanks is often paler and less extensive, sometimes appearing more ochraceous or a duller orange hue. **Plumage - Juvenile:** Juveniles exhibit a distinctly different plumage pattern from adults. The upperparts are mottled brown, often with buff or pale spotting, giving a somewhat scaled appearance. The underparts are paler, typically buffish or whitish, with dusky scaling or mottling, particularly on the breast and flanks. They lack the characteristic rufous-orange of the adults and the dark head. **Distinguishing Features:** Key identification points include the combination of the olive-brown upperparts, the contrasting dark head (especially pronounced in males), the bright rufous-orange breast and flanks, the clean white throat, and the rufous-chestnut tail. The extent and vibrancy of the rufous on the underparts and the distinct tail color are crucial for differentiating *Larvivora namiyei* from closely related species within its genus.
分类信息
**Taxonomy Summary for *Larvivora namiyei*** **Current Classification:** * **Order:** Passeriformes * **Family:** Muscicapidae (Old World Flycatchers and Chats) * **Genus:** *Larvivora* Hodgson, 1845 * **Species:** *Larvivora namiyei* (Stejneger, 1887) **Original Description and Early Classification:** The species was originally described as *Erithacus namiyei* by Stejneger in 1887 (Proceedings of the United States National Museum, Vol. 10, pp. 484-485). For a significant period, it was widely classified within the genus *Luscinia*, commonly appearing as *Luscinia namiyei* in major checklists and field guides, including those influenced by Sibley & Monroe (e.g., *Distribution and Taxonomy of Birds of the World*, 1990; *A World Checklist of Birds*, 1993). **Significant Taxonomic Revisions and Splits:** The placement of *Larvivora namiyei* underwent a significant revision based on molecular phylogenetic studies that revealed the traditional genus *Luscinia* to be polyphyletic. * **Sangster et al. (2010)**, in their study "Multi-locus phylogenetic analysis of Old World chats and flycatchers reveals extensive paraphyly at family, subfamily and genus level (Aves: Muscicapidae)" (Molecular Phylogenetics and Evolution, Vol. 55, No. 3, pp. 1088-1096), provided strong molecular evidence supporting the reclassification of several species, including *L. namiyei*, into the resurrected genus *Larvivora*. This move was based on the species' close genetic relationship with other *Larvivora* species. * Further molecular research, such as that by **Zhao et al. (2017)** ("Phylogenetic relationships of Luscinia and Larvivora (Aves: Muscicapidae) based on mitochondrial and nuclear DNA sequences" in Molecular Phylogenetics and Evolution, Vol. 114, pp. 159-166), reinforced the monophyly of *Larvivora* and confirmed the appropriate placement of *L. namiyei* within this genus. **Alternate Names and Synonyms:** * *Erithacus namiyei* Stejneger, 1887 (Original scientific name) * *Luscinia namiyei* (Stejneger, 1887) (Widely used prior to molecular revisions) Common names include Namiye's Thrush and Ryukyu Robin. **Authorities Adopting Changes:** Major ornithological authorities and checklists have adopted the *Larvivora* placement for *L. namiyei* following these molecular findings. These include: * **International Ornithological Congress (IOC) World Bird List** (Gill, F. & Donsker, D. (Eds.), continuously updated) * **Clements Checklist of Birds of the World** (Cornell Lab of Ornithology, continuously updated) * **Handbook of the Birds of the World (HBW) and BirdLife International** (HBW Alive, updated)
- 学名
- Larvivora namiyei
- 命名信息
- (Stejneger, 1887)
- 目
- Passeriformes
- 科
- Muscicapidae
- 属
- Larvivora
分布与栖息地
Endemic to the northern and central Ryukyu Islands of Japan, primarily Okinawa Island and some smaller surrounding islands (e.g., Kumejima, Tokashiki, Zamami). It inhabits dense undergrowth in evergreen broadleaf forests, often near streams or in damp areas, and can also be found in secondary growth and plantations.
- 繁殖区
- Okinawa Island and nearby smaller islands in the central Ryukyu Islands, Japan.
- 迁徙
- Resident species
行为
Sometimes forages for food near the ground. Predation by invasive species such as the small Indian mongoose negatively impacts the Okinawa Robin.
保护状况
Population: 10,000-19,999 mature individuals. Trend: Decreasing. Range: 1,200 km². IUCN Status: Near Threatened.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Orange Weaver
Ploceus aurantius
A medium-sized weaver with a long, relatively slim bill. Male is mostly bright yellow with an orange throat and black lores. The female is much duller, greenish-yellow with a white belly. The eye color of both sexes can be whitish or red, and the bill can be mostly pinkish or black. A colonial nester that is found around wetlands, including lakes, rivers, and swamps. Similar to Holub’s Golden-Weaver, but smaller and slimmer-billed. Female can be confused with several other female and non-breeding male weavers, but is usually found in association with the more distinctive males. Vocalizations are typical of weavers: “chet” notes and a sizzling “radio static” song.
Moustached Treeswift
Hemiprocne mystacea
An enormous, long-tailed swift of lowland and foothill forest edge. In flight, long, thin wings with a white line behind the black trailing edge, and a long, forked tail usually held to a point. When perched in trees, shows 2 white plumes along the face, and males have a rusty ear-patch between. Often seen flying at dawn and dusk. The only treeswift in its range and no other swift comes close to the size or tail length. A sharp “kwik! kwik! kwik” or downward, raptorlike “kweeuu!”.
Rufous-backed Fantail
Rhipidura rufidorsa
A fairly small, long-tailed bird of lowland and foothill forest interior. Plain brown underparts and head with rufous wings and rump. Black tail with obvious white tips which it often keeps fanned and cocked. Does not normally co-occur with other brown fantails. Possible overlap with Arafura Fantail although that species has black face and chest markings. Similar to female Rufous Fantail but Rufous-backed is found at lower elevations and lacks the rufous underparts and head. Voice, a lazy, downward series of slurred whistles, sounding like ‘Three Blind Mice’.
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