Lesser Swamp Warbler
Acrocephalus gracilirostris
Nondescript, long-tailed, long-billed warbler of wetlands. Varies geographically, with the back being olive-brown to rusty-brown, and the underparts pure white to pale brown. Found in reedbed wetland habitat, including papyrus. Far less secretive than many marsh-dwelling warblers; often hops about in the open. Frequently sings a variable, complex mix of raspy and musical notes that usually ends in a trill. Smaller than Greater Swamp Warbler, larger than African Reed Warbler, and shorter-winged than Great Reed Warbler.
识别特征
The lesser swamp warbler is a plain-coloured smallish bird 14–16 cm long and weighing around 20 g. Its upperparts are rich brown, and it has a white supercilium. The underparts are white, with a rufous wash to the flanks. The long, strong bill has a slightly down-curved upper mandible; it is blackish-yellow with a yellower base. The legs are blue-grey and the eyes are brown. Adults of both sexes and juvenile birds are very similar in appearance.<p>The song is rich and melodious, a series of bubbly phrases that include trilling notes, cheerup chee trrreee and a large number of variations, with pauses between phrases.
分类信息
- 学名
- Acrocephalus gracilirostris
- 命名信息
- (Hartlaub, 1864)
- 目
- Passeriformes
- 科
- Acrocephalidae
- 属
- Acrocephalus
分布与栖息地
- 迁徙
- Resident species
行为
The lesser swamp warbler builds a deep, firm cup nest from strips of reed blades, grass and sedges, which is lined with finer grasses. It is always placed in reeds above water. It nests mainly from August to December, with the earliest nesters being those in the winter rainfall areas of the Western Cape Province. It lays two or three brown eggs. This species is monogamous, pairing for life.<p>The lesser swamp warbler is usually seen alone or in pairs, moving through wetland reedbeds, and clambering up and down reed stems. It eats insects and other small invertebrates.
保护状况
This common species has a large range, with an estimated extent of 5,700,000 km2. The population size is believed to be large, and the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
White-cheeked Antbird
Gymnopithys leucaspis
Distinctive antbird with pale blue eyering and snowy white underparts and rusty upperparts. Black eyebrow and cheek extends through neck sides and down flanks. Occurs in lowland rainforest east of the Andes; no range overlap with similar Bicolored Antbird. Most often seen in the vicinity of army ant swarms, perched on vertical branches or vines close to the ground. Several individuals may gather at a large ant swarm. Listen for harsh descending “churr” calls that might be a clue that there’s an ant swarm nearby.
Yellow-billed Teal
Anas flavirostris
Widespread and often common small duck of wetlands, lakes, river mouths, Andean bogs, and streams. Rather small and compact with a dark head, a bright yellow bill (duller for a short while on young birds), and plain grayish sides. The similar Yellow-billed Pintail is larger and more elegant with a paler head and mottled sides. Teal populations in the high Andes (“Altiplano Teal”) have noticeably paler gray sides than southern lowlands birds (“Austral Teal”).
Lesser Roadrunner
Geococcyx velox
Slightly smaller version of the familiar cartoon Greater Roadrunner, but usually the two species do not occur in the same places. Favors dry brushy woodland and overgrown weedy fields in tropical lowlands and foothills. Can be very elusive, but at other times runs out in the road or sits quietly sunning itself on a fence post or bush top in the early morning. Note that the center of the throat and breast are plain rich buffy, without the dense dark streaking of Greater Roadrunner.
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