Sociable Weaver
Philetairus socius
A small, dumpy buff-and-brown weaver with a blue-gray bill, a dark bib, and scaly patterning on the back and flanks. Juveniles are duller, lacking the bib and scaling. It is restricted to open arid country, where hundreds can breed colonially in gigantic grass nests that are placed in trees or on man-made structures. Small to large groups forage on the ground, hopping and running after insects and seeds. The Scaly Weaver is smaller than the Sociable Weaver, is far less gregarious, and has a pinkish bill.
识别特征
Measuring around .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}14 cm (5+1⁄2 in) in length, the sociable weaver has a black chin, black, barred flanks, and a scalloped back. It typically weighs 26–32 g (15⁄16–1+1⁄8 oz), and sexes are indistinguishable.
分类信息
The sociable weaver was first described by ornithologist John Latham in 1790. Alternative names include the common social weaver, common social-weaver, and social weaver. Formerly, four subspecies were recognised, but the species is now considered monotypic. The sociable weaver is the only extant species in the genus Philetairus.<p>Based on a 2017 DNA-analysis, P. socius belongs to the group of sparrow weavers (subfamily Plocepasserinae) and is most related to the genus Pseudonigrita. These two genera are the sister group of the genus Plocepasser. The most basic genus of the subfamily is Sporopipes. Provided that genera are correct clades, the following tree expresses current insights.
- 学名
- Philetairus socius
- 命名信息
- (Latham, 1790)
- 目
- Passeriformes
- 科
- Ploceidae
- 属
- Philetairus
分布与栖息地
The species ranges across northwestern South Africa and southwest Botswana, and extending northwards across Namibia. It is strongly associated with the arid savannas characteristic of the southern Kalahari region. The presence of stiff grasses such as Stipagrostis ciliata (syn. Aristida ciliata) – an important nesting material – is an important determinant of its distribution. The taller grasses and the fire-prone nature of the Northern and Central Kalahari regions may be a factor for the absence of the bird in those regions. The area is semiarid with low and unpredictable rainfall occurring mostly in the summer. The population has not been quantified, but the birds are described as "common to abundant".
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Chilean Mockingbird
Mimus thenca
Common and conspicuous bird of central Chile, especially in drier regions. Favors open and semiopen habitats, especially matorral and scrubby hillsides, but also in town parks and farmland. Often seen perched on roadside wires and posts, or running along roadsides with tail cocked. No other mockingbirds normally in same range. Note bold pale eyebrow, dark whisker, dark streaks on flanks, and bold white tail corners in flight.
Bornean Bulbul
Rubigula montis
Attractive and distinctive bulbul. Olive-yellow back, bright yellow throat and underparts, and black head with upright crest. A species of hill and submontane forests and forest edge; restricted to northern and central Borneo. Often encountered in degraded or regenerating forest. Commonly perches out in fairly open areas. Gives short series of bright “jyep” notes.
Bismarck Boobook
Ninox variegata
A rather small owl with a grayish-brown head, brown upperparts spotted with white, and whitish underparts barred with rufous. Common in most forests up to at least 1000 meters of elevation. Differs from the similar New Britain Boobook in barred rather than spotted underparts, lack of contrastingly dark chest, and lack of slim white eyebrows. Ranges unlikely to regularly overlap. Voice is a gruff, frog-like “kra-kra-kra-kra.”
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