Trilling Tapaculo
Scytalopus parvirostris
Tiny, compact gray bird. Females are slightly duller, with brown lower sides and rump. Like most tapaculos, they are usually very shy and rarely seen in the open. Nearly identical to Tschudi’s Tapaculo, which is found at higher elevations where the two overlap; their songs are also very different. Trilling Tapaculo’s song is a long, rapid chatter.
识别特征
The trilling tapaculo is 10.5 cm (4.1 in) long. Males weigh 17.5 to 21 g (0.62 to 0.74 oz) and females 15.4 to 18 g (0.54 to 0.63 oz). Adult males are usually dark gray above and lighter gray below, though sometimes dark gray all over. The flanks and crissum (the area around the cloaca) are dark reddish brown with dusky bars. The female is similar to the male but paler with a dark brown wash. The juvenile is similar to the female with the addition of a scaly appearance due to yellowish edges to feathers.
分类信息
The trilling tapaculo was previously considered a subspecies of unicolored tapaculo (Scytalopus unicolor) but was elevated to species status based on differences in their vocalizations. Though it is monophyletic, there are song variations in different parts of its range that suggest that there might be undefined subspecies.
- 学名
- Scytalopus parvirostris
- 命名信息
- Zimmer, JT, 1939
- 目
- Passeriformes
- 科
- Rhinocryptidae
- 属
- Scytalopus
分布与栖息地
The trilling tapaculo is found on the east slope of the Andes from southern Amazonas, Peru, southeastward to western Santa Cruz in Bolivia. It inhabits the undergrowth of humid montane forest between the elevations of 1,800 and 2,500 m (5,900 and 8,200 ft) in Peru. In Bolivia it is found from 2,000 to 3,200 m (6,600 to 10,500 ft) and locally to 3,300 m (10,800 ft).
- 迁徙
- Resident species
行为
The trilling tapaculo forages in dense undergrowth alone or in pairs, on or near the ground. Its diet has not been studied.<p>Until a 2014 publication nothing was known about the trilling tapaculo's breeding biology other than that a juvenile was collected in July. In 2009 researchers discovered a nest in Peru. It was a globe with an outer layer mostly of small rootlets lined mostly with fern scales. It was constructed in a cavity in a rotten tree and contained two eggs. The authors monitored incubation but did not specify whether one or both adults incubated. The eggs hatched seven days after discovery and the nestlings disappeared soon after; they were too young to have fledged so the authors concluded that the nest had been predated.<p>The trilling tapaculo's song gives it its name. The trill's pace varies geographically, at 21 notes per second in central Peru [1], 14 in southern Peru [2], and 20 to 28 in Bolivia [3]. Its scold is similar but shorter [4] and it also has a single-note call [5].
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Pel's Fishing-Owl
Scotopelia peli
A giant, round-headed, ginger-rufous owl covered by dusky bars, spots, and chevrons. Quite shy; day-roosts are well-hidden in huge trees along permanent rivers and forested swamps with sluggish backwaters. The call is a deep, low, horn-like “Ooom”; also produces a series of grunts. Young birds sometimes emit an eerie screeching: “wheeeuuu”. Similar Rufous Fishing-Owl is smaller and brighter; it lacks bars and chevrons on the underparts. Vermiculated Fishing-Owl has a heavily-streaked upper breast and a pale-yellow (not black) beak.
Caucasian Snowcock
Tetraogallus caucasicus
Large and heavily-built gamebird of the Caucasus Mountains. Grayish overall, with a whitish face and throat. Also note coarse rusty-brown-and-white streaking on the back and sides. Inhabits the high rocky reaches of the mountains, from the forest’s upper limit up to the snowline; will move down the mountains in response to especially harsh winter snowstorms. Song is a loonlike, desolate, rising whistle. Gives loud “chuk” calls when alarmed.
Lesser Black-backed Gull
Larus fuscus
Slender, long-winged gull, slightly smaller than Herring Gull. Adults show dark gray back and yellow legs; in winter note fairly heavy streaking on head and neck. Takes four or five years to reach adult plumage; immatures can be difficult to distinguish from other gulls, especially Herring. On first- or second-year birds, look for contrastingly whitish head with dark smudge around the eye, long wings, dark bill, whitish rump and tail base, and evenly dark wings in flight. Can be found around any body of water but prefers beaches and flats. Often with flocks of other large gulls. Common in Eurasia, wintering to Africa and Southeast Asia. Population in North America has increased dramatically in the last couple decades; now regular (even fairly common!) on the Atlantic coast, rarer inland and farther west.
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