Scaly-breasted Wren
Microcerculus marginatus
Dark, short-tailed wren, quite shy and difficult to see. Overall brown with paler grayish throat and rather long, straight bill. Some populations have more scaling on breast than others. Found on the ground inside forest, where it makes an interesting song. Listen for a series of whistled notes, starting off high-pitched with a few in rapid succession, then each note dropping in pitch and spaced further and further apart. The whole series can last for minutes. Far more often heard than seen.
识别特征
The southern nightingale-wren is 11 cm (4.3 in) long; males weigh 18.2 to 22 g (0.64 to 0.78 oz) and females 17 to 18 g (0.60 to 0.63 oz). Adults of the nominate subspecies have a dull gray-brown face and deep chocolate-brown crown and upperparts with a reddish tinge on the rump. They have a very short dark chocolate tail. Their chin, chest, and upper belly are white with some black scalloping on the sides of the chest. The lower flanks and lower belly are dark chocolate. The juvenile is similar with the addition of darkish barring on the crown and back and dark brown feather tips on the underside.<p>M. m. squamulatus is similar to the nominate but has scaly markings on the underparts. M. m. taeniatus also has scaly underparts and a more extensive reddish tinge on the upperparts and blackish barring below. M. m. corrasus is also similar to the nominate, but is a purer white below with narrow dark bars. M. m. occidentalis has a longer and thinner bill, darker upperparts and flanks, and broad dark bars on its abdomen. M. m. luscinia's throat is pale gray that becomes brownish gray on the breast and belly.
分类信息
The southern nightingale-wren forms a species pair with the northern nightingale-wren (Microcerculus philomela) and was in the past considered conspecific with it. It is currently treated as a species in its own right by the International Ornithological Committee (IOC) and the Clements taxonomy, though under different English names.<p>The southern nightingale-wren has the six subspecies listed below. Subspecies M. m. luscinia is treated by some taxonomists as a separate species. The nominate subspecies M. m. marginatus is also sometimes considered a separate species or even two species divided by the Amazon River.<p>The southern nightingale-wren's subspecies are:
- 学名
- Microcerculus marginatus
- 命名信息
- (Sclater, PL, 1855)
- 目
- Passeriformes
- 科
- Troglodytidae
- 属
- Microcerculus
分布与栖息地
The subspecies of southern nightingale-wren are found thus:<p>The southern nightingale-wren inhabits the lower levels of dense humid tropical forest. It has been recorded from sea level to 1,700 m (5,600 ft) in Costa Rica, to 1,400 m (4,600 ft) in Colombia, and to 1,800 m (5,900 ft) in Venezuela. There is also one record in Panama at 3,100 m (10,200 ft).
- 迁徙
- Resident species
行为
The southern nightingale-wren usually forages alone, on the ground and low in the understory. Little is known about its diet. It has been observed following army ant swarms in Central America but apparently does not do so routinely.<p>Most of the data on the southern nightingale-wren's breeding phenology was recorded in Panama. Reports of active nests, fledged young, and adults in breeding condition indicate almost year-round breeding activity. Two nests have been described; they were constructed of leaves at the end of burrows that were probably excavated by other species of birds. One had two eggs and the other three.<p>The songs of the southern nightingale-wren differ geographically. Those in Central America to western Amazonia are long complex series of short notes followed by several whistles. Those in Peru and Bolivia are " clear, pure notes given at random" with varying pitch, length, and volume.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Gray-headed Tanager
Eucometis penicillata
Small, uncommon tanager of humid tropical lowland forest, sometimes found at army ant swarms. Typically inhabits low to mid-levels of shady understory, as singles or pairs. Sexes look alike, with bushy gray head cleanly cut off from the rich yellow underparts and olive-green upperparts. Song is a rich squeaky warble, at times prolonged.
Curlew Sandpiper
Calidris ferruginea
Medium-sized wader with a long, slightly downcurved bill. Slightly larger than Dunlin, with longer and finer bill, longer legs. In flight note large white rump patch. Breeding plumage deep rusty on head and body (like Red Knot). Non-breeding birds are grayish-brown above with white eyebrows and belly. Juvenile is grayish above with neat scaly feather edgings, whitish below with variable buffy wash on breast. Breeds in Russian tundra and winters in Africa, Australia, and South and Southeast Asia. Mainly in coastal wetland habitats, often with flocks of Dunlin.
Arabian Green Bee-eater
Merops cyanophrys
A small, dainty bee-eater of arid, open terrain with scattered trees, including semideserts, palm groves, and gardens. Mainly green with a slender black face mask, throat band, and a stunning electric-blue face and throat. Juveniles are duller than adults and lack the short tail spike. In flight, note the rusty underwing with a black trailing edge. Flies gracefully as it catches insects and other prey. Calls are a series of gentle liquid trills or more staccato notes.
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