Tawny-faced Gnatwren
Microbates cinereiventris
Small wrenlike bird that often follows mixed flocks or ant swarms in the forest understory. Difficult to see well; look for tiny size, rufous cheek, white throat, and long straight bill. Similar to Long-billed Gnatwren but tail and bill shorter with generally darker and more contrasting plumage. Listen for harsh chattering calls and clear “peeew.”
识别特征
The tawny-faced gnatwren is 9 to 11 cm (3.5 to 4.3 in) long and weighs 10 to 14 g (0.35 to 0.49 oz). The nominate subspecies has a rusty face with a rufous crown and a thin black stripe behind the eye. A wide black malar stripe ("moustache") separates its face from the white throat and upper breast; the last has thin black stripes. Its back is brown and its underparts are gray. The sexes are alike. The other subspecies differ in the intensity of their cheek and underparts colors, and some do not have the black stripe behind the eye.
分类信息
The International Ornithological Committee (IOC) and BirdLife International (BLI) recognize seven subspecies of tawny-faced gnatwren:<p>However, the South American Classification Committee of the American Ornithological Society (SACC/AOS) and the Clements taxonomy have not accepted the three subspecies that Olson described but include them within M. c. peruvianus.
- 学名
- Microbates cinereiventris
- 命名信息
- (Sclater, PL, 1855)
- 目
- Passeriformes
- 科
- Polioptilidae
- 属
- Microbates
分布与栖息地
The subspecies of tawny-faced gnatwren are distributed thus:<p>The tawny-faced gnatwren generally inhabits the lower strata of wet, humid, primary and secondary forest, mostly below 750 m (2,460 ft) elevation. The exception is M. c. unicus, which is "known only from a single specimen...[collected] on an undetermined date between 1930 and 1943" in a much drier biome.
- 迁徙
- Resident species
行为
The tawny-faced gnatwren's diet is primarily ants and other insects but also includes spiders. It forages through foliage and leaf litter while hopping through undergrowth near the ground. It regularly joins mixed-species foraging flocks but rarely follows army ant swarms.<p>Information on the tawny-faced gnatwren's breeding phenology is sparse. Nesting has been recorded in April in Costa Rica and between December and May in Colombia. The one fully-described nest was constructed of green moss with a soft inner lining. It was attached to the trunk and a limb of a broadleaf shrub and contained two eggs.<p>The tawny-faced gnatwren's song is "a series of soft, clear, plaintive notes, 'teeeeea' or 'teeeéuw'" [1]. Its most common call is "a nasal, complaining 'nyeeeh' or 'nyaaah'" [2]. It also makes a chatter [3].
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Papuan Black Myzomela
Myzomela nigrita
A small honeyeater of foothill forest canopy and edge. Male is uniform jet black and female dull brown with a red forehead and chin. Similar to male Black Sunbird, but male Papuan Black Myzomela lacks the iridescence and white underwings. Similar to female Red and Elfin Myzomelas but female Red has a red tail and female Elfin lacks the red forehead. Call, a simple, high-pitch “tsip!” like other myzomelas.
Magellanic Tapaculo
Scytalopus magellanicus
Often heard but rarely seen; a retiring little gray bird of bamboo thickets and other dense shrubbery at forest edges and along streams, mainly in humid areas. Occurs locally in boulders and low scrub, mainly in the Andes. Can move very quickly through bamboo like a mouse. Plumage is slaty gray overall, often with some paler or brownish barring; some birds have a silvery-white cap or a few white head spots. Best told from Dusky Tapaculo, which has a limited range overlap by voice. Also compare with Ochre-flanked Tapaculo.
Brown-breasted Gerygone
Gerygone ruficollis
A small bird of montane forest edge and villages. Whitish underparts, dark brown back, warmer brown on the head, extending to the sides of the chest. Note the broken white eye-ring and white band in the outer tail feathers. Forages very actively in small groups, twitching its tail. Co-occurs with the similar Gray Thornbill and their vocalizations are also similar, but Brown-backed Gerygone is distinctly brown rather than gray. Song, a series 5 or more slurred notes of the same pitch, descending slightly each time. Call, an excited chatter.
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