White-throated Screech-Owl
Megascops albogularis
Large screech-owl found in temperate forests, typically from around 2,300–3,400 m. Quite dark brown overall with small pale spots and bars covering head, back, and wings. Belly is paler tawny with dark streaks. White throat patch is usually obvious. Sexes similar. Strictly nocturnal and thus more often heard than seen; listen for a fairly short and slow series of toots that descends in pitch, often given as a duet.
识别特征
The white-throated screech owl is a large member of its genus. It is 20 to 26 cm (7.9 to 10.2 in) long and weighs 130 to 185 g (4.6 to 6.5 oz). It is overall dark plumaged, has a round head with very small ear tufts, and a longish tail. Adults of the nominate subspecies have a dark brown head and upperparts with small blackish, reddish, and white marks. Their flight feathers and tail have narrow darker bars. They have a dark facial disc with whitish marks above and below the orange eyes and a large white area below the bill that in some postures looks like large moustaches. Their chest is dark brown with tawny spots and their belly is tawny with dusky bars and streaks. The juvenile is pale buffy gray and has a black "mask" and barring on its crown, mantle, and underparts.<p>M. a. meridensis has a whitish forehead and eyebrows, a suggestion of a nuchal collar, and a paler belly than the nominate. M. a. macabrus is similar to the nominate but with finer markings on the underparts. M. a. obscurus and M. a. remotus are darker than the nominate, blackish above with few lighter spots, a dark breast, and only faint bars and streaks on the belly.
分类信息
The white-throated screech owl was described by the American ornithologist John Cassin in 1849 and given the binomial name Syrnium albo-gularis. Five subspecies are currently recognized:<p>However, its taxonomy is not certain. The species has sometimes been placed in the monotypic genus Macabra, but DNA studies show it is closely related to several other Megascops owls. At the subspecies level, M. a. obscurus is sometimes considered a color morph of M. a. meridensis or M. a. remotus. The population of rufescent screech owl (Megascops ingens) in eastern Ecuador has sometimes been considered to be another subspecies of white-throated screech owl (M. a. aequatorialis) or be part of the nominate M. a. albogularis.
- 学名
- Megascops albogularis
- 命名信息
- (Cassin, 1849)
- 目
- Strigiformes
- 科
- Strigidae
- 属
- Megascops
分布与栖息地
The subspecies of the white-throated screech owl are found thus:<p>The white-throated screech owl inhabits the interior and edges of open humid evergreen montane forest and cloud forest and semi-open areas of scattered trees. In elevation it usually ranges between 2,000 and 3,000 m (6,600 and 9,800 ft) but is found locally as low as 1,300 m (4,300 ft) and, on the east slope of the Peruvian Andes, as high as 3,700 m (12,100 ft).
- 迁徙
- Vertical migration
行为
The white-throated screech owl is nocturnal. It forages in the forest canopy, mostly for insects and other arthropods and perhaps small vertebrates as well.<p>Information about the white-throated screech owl's breeding phenology is scarce. Unlike most other members of genus Megascops, which nest in cavities, it has been reported to nest on the ground or in an old cup nest of another species.<p>The white-throated screech owl has several vocalizations. What is believed to be its primary male song is "gruff, barked notes, 'churrochurro-churro-chu chu chu chu'" given for up to a minute. A secondary song is "evenly spaced hoots, [about] 5 per second". Members of a pair sing in duet, with the female having a higher pitch. The female also has various agitation calls.
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Western Bearded-Greenbul
Criniger barbatus
A big, chunky, relatively colorful rainforest greenbul. Mostly olive-green, with a reddish tail and a mostly gray head. The throat feathers are long and often puffed out; they are rich yellow in most of the range, but pale yellow in Nigeria. Found in the understory and at middle levels of rainforest and gallery forest. Usually in small, noisy groups that often join mixed flocks. Similar to Yellow-bearded Greenbul, but larger, with a puffier throat and some gray in the plumage. Similar to Red-tailed Greenbul, but larger, and never shows a pure white throat. Somewhat similar to Icterine Greenbul, but larger, and much darker on the breast and belly. The loud and distinctive call is a rising, two-part “truwa-treeeaa.”
Northern Boobook
Ninox japonica
A slender brown owl with comically expressive golden eyes. Dark brown above and white below with long dark streaks on the breast. Its long tail and streaked undersides give it a distinctly hawklike profile in flight. Usually found in forests but occasionally shows up in small parks, especially on the coast during migration. Hunts flying insects at night and sometimes found around artificial lights. Gives an extended series of paired hoots.
Blue-backed Conebill
Conirostrum sitticolor
Small attractive tanager, fairly common and widespread in the temperate zone of the Andes from Venezuela to Bolivia. Black head, blue back, black wings, and burnt-orange belly. Sexes alike. Where it overlaps with Chestnut-bellied Mountain-Tanager note the conebills smaller size and more pointed bill. Typically found in pairs or small family groups working the middle and upper levels of temperate forest and edge. Often follows mixed-species flocks.
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