Beautiful Treerunner
Margarornis bellulus
Rare but unique within a tiny range near the border of Panama and Colombia. Small brown bird that hitches along mossy limbs in humid cloud forest. Look for a buffy eyebrow, a white throat, and pale spotting on the underparts. Sexes alike. Similar to Pearled Treerunner but no range overlap; also note duller brown (not rufous) upperparts. Typically seen singly or in pairs, often following a mixed-species flock.
识别特征
The beautiful treerunner is 14 to 15 cm (5.5 to 5.9 in) long and weighs 18 to 19 g (0.63 to 0.67 oz). The sexes have the same plumage. Adults have a buffish-white supercilium that extends to the nape, a dull reddish brown line behind the eye, dark brown ear coverts with whitish streaks, and a dark brown "moustache" with white spots that become stripes toward the neck. Their crown is olive brown and their upperparts and wing coverts warm olive-brown. Their flight feathers are dark fuscous with tawny-ochraceous edges. Their tail is dull reddish brown; the ends of the tail feathers lack barbs, giving a spiny appearance. Their throat is whitish and the rest of their underparts rufescent brown. Their upper breast has whitish oval spots with dark brown rims that become narrow stripes on the belly. Their iris is brown, their maxilla brownish, their mandible pinkish, and their legs and feet gray.
分类信息
Some authors have proposed that the beautiful treerunner and the pearled treerunner (M. squamiger) are conspecific or sister species, but these treatments were disproven in a 2011 publication.<p>The beautiful treerunner is monotypic.
- 学名
- Margarornis bellulus
- 命名信息
- Nelson, 1912
- 目
- Passeriformes
- 科
- Furnariidae
- 属
- Margarornis
分布与栖息地
The beautiful treerunner has a disjunct distribution within Panama. It is found in the Serranía de Majé of Panamá Province and in several ranges in the extreme east of Darién Province. It inhabits montane evergreen forest, mostly at elevations between 1,350 and 1,600 m (4,400 and 5,200 ft) but in a few places as low as 900 m (3,000 ft).
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Scaly-throated Foliage-gleaner
Anabacerthia variegaticeps
Rather active, arboreal bird of humid evergreen forest in foothills and highlands. Forages at all levels clambering along branches and amid mossy tangles and epiphytes, at times hanging upside down like a chickadee. Often in pairs or small groups; frequently joins mixed-species feeding flocks. Note the behavior, grayish head with rich buffy spectacles, and pale buff throat (scaly markings often hard to see).
Red-throated Caracara
Ibycter americanus
Large, raucous forest raptor. Unmistakable by virtue of its size, social habits, and loud, incessant calls. At a distance, note slow flight and contrasting white belly. Found in regions of continuous lowland forest; does not occur in extensively disturbed areas. Mostly observed in the canopy and mid-story where it knocks down wasp and bee nests to the ground to feed on the larvae; also consumes fruit. Groups will approach and mob humans passing through their territory.
Gray-backed Storm-Petrel
Garrodia nereis
A very small seabird of southern oceans. Gray-black on head, neck, throat, and top of breast. Back and upperwing are paler in color and rump is ash-gray. Note the white belly and white underwing with a black edge. Shows relatively short black legs and square tail. Forages in deep waters of the subantarctic; in the New Zealand region, rarely seen near the mainland. Differs from other black-and-white storm-petrels by its gray rather than white rump. White-faced Storm-Petrel also has a gray rump but is larger with longer legs, white on the face, and a more bounding flight.
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