Alagoas Antwren
Myrmotherula snowi
Very rare antwren, unmistakable in its tiny range, likely now restricted to one complex of humid forest fragments in the Brazilian state of Alagoas. Males are gray with a blackish throat and females are cinnamon-colored. Forages in the understory and middle levels of the forest, usually accompanying remnant mixed-species flocks. The song is a high sharp series of whistles.
识别特征
The Alagoas antwren is 9.5 to 10.5 cm (3.7 to 4.1 in) long and weighs about 8 to 11.5 g (0.28 to 0.41 oz). It is a small bird with a short tail. Adult males are almost entirely gray, with lighter underparts than upperparts. Their throat feathers have black bases and gray tips. Adult females are mostly rufous-brown with darker wing coverts and paler cheeks and throat. Their iris is brown, their bill brownish gray, and their legs and feet leaden gray.
分类信息
The Alagoas antwren was originally described as a subspecies of the unicolored antwren (M. unicolor) but since the late twentieth century has been recognized as a full species. The two form a superspecies. The Alagoas antwren, the unicolored antwren (M. unicolor), the Yungas antwren (M. grisea), and the plain-winged antwren (M. behni) appear to form a monophyletic group with similar vocalizations and habitat requirements.<p>The Alagoas antwren's specific epithet honors David Snow, a British ornithologist "who was a pioneer in life history studies of Neotropical birds".
- 学名
- Myrmotherula snowi
- 命名信息
- Teixeira & Gonzaga, 1985
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Myrmotherula
分布与栖息地
The Alagoas antwren was first discovered in 1979, near Murici in the eastern Brazilian state of Alagoas, and for many years was known only from that area. In the early 21st century it was discovered at several sites in Pernambuco, about 500 km (310 mi) further north. However, by about 2020 it could again be found only at Murici. It inhabits isolated fragments of semi-humid lowland evergreen forest and is known only from the narrow elevational range of 430 to 790 m (1,400 to 2,600 ft). "No doubt the distribution was much more widespread and continuous, before most forests in this region were cleared".
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Pectoral Antwren
Herpsilochmus pectoralis
Attractive small antwren. Males are gray with a black crown and a diagnostic black patch on the chest; females have a cinnamon head and underparts and brownish upperparts. Inhabits deciduous forest, gallery forest, and caatinga woodland, where it forages from the understory to the canopy, often accompanying mixed-species flocks. The song is a rapid rising series of slightly harsh “caa” notes.
Chaco Chachalaca
Ortalis canicollis
Large noisy bird with a long tail. Rather uniform brown plumage with little contrast between its head and the rest of the body. Inhabits swampy forest, savanna, and second growth, where found in groups which may exceed 30 individuals. Feeds on fruits and seeds on the ground or in trees. Gives a typical loud chachalaca song, a rollicking duet “bink, ka chee chaw raw taw, chaw raw taw, chaw raw taw.” Calls include a low “cha-cha-cha.”
Indian Roller
Coracias benghalensis
A brightly colored bird with various shades of blue on the wings, tails, and belly that are often more prominent in flight. Note the longitudinal white streaks on the throat and breast. Indochinese Roller has a purple-blue breast, a darker olive back, and is generally darker blue. Generally silent, but more vocal in breeding season with harsh calls. Prefers open areas, including agricultural landscapes, sitting on exposed perches including electric wires, occasionally pumping its tail slowly. Practically a resident roller with some movements in the western parts of its range.
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