Band-tailed Barbthroat
Threnetes ruckeri
Scarce hummingbird of humid evergreen forest and edge in tropical lowlands. Favors shady understory, especially with Heliconia flowers. Usually visits flowers briefly and whips away with a sharp buzzy squeak. Note long arched bill (yellowish below), striped face, blackish throat patch, and rusty breast patch. Striking tail pattern, black with white tips, and a white base that is only readily seen when the tail is spread.
识别特征
The band-tailed barbthroat is 10 to 11 cm (3.9 to 4.3 in) long. Males weigh 5.5 to 7 g (0.19 to 0.25 oz) and females 5 to 7 g (0.18 to 0.25 oz).The adult male of the nominate subspecies has bronze-green upperparts, a dark ear patch and chin, and a dusky malar stripe. The tail is dark with white bases and tips to the feathers that create a black band near the end. The throat is ochraceous and the underparts are otherwise gray with some green feathers. It has a nearly straight bill. As with other hermit hummingbirds, the sexes are similar; the female's bill is somewhat more decurved than the male's and the plumage has less contrast among the throat, breast, and belly. Young birds resemble the adult but have ochraceous feather edges. T. r. venezuelensis has a somewhat larger ochraceous throat patch than the nominate. T. r. ventosus has a much larger and bright orange throat patch and an ochraceous tinge to the belly.
分类信息
The band-tailed barbthroat has the three subspecies listed. A fourth proposed subspecies, T. r. darienensis of the Panama-Colombia border area, shares the characteristics of all three recognized subspecies. The band-tailed barbthroat and the other two members of its genus pale-tailed barbthroat (T. lecurus) and sooty barbthroat (T. niger) form a superspecies.
- 学名
- Threnetes ruckeri
- 命名信息
- (Bourcier, 1847)
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Threnetes
分布与栖息地
T. r. ventosus is the northernmost subspecies of band-tailed barbthroat. It is found from eastern Guatemala and Belize through Honduras, Nicaragua, and Costa Rica into Panama. The nominate T. r. ruckeri is found from northern and western Colombia south through western Ecuador almost to Peru. T. r. venezuelensis is found in northwestern Venezuela. The species inhabits the understory and edges of primary forest and old second growth, and also semi-open shrublands, thickets, and plantations. In elevation it ranges from sea level to 1,200 m (3,900 ft).
- 迁徙
- Resident species
行为
The band-tailed barbthroat is presumed to be sedentary. However, some movement has been noted after the breeding season, especially among young birds.<p>Like other hermit hummingbirds, the band-tailed barbthroat is a "trap-line" feeder, visiting a circuit of flowering plants. It feeds on nectar at Heliconia and other tubular flowers and also on small arthropods, especially spiders. In addition to probing flowers for nectar, it also "robs" by piercing the base of the tube.<p>The band-tailed barbthroat's nesting season varies widely across its range. Its nest is a cup of plant and other fibers and cobweb attached to the underside tip of a long drooping leaf. The female alone incubates the two white eggs, though males have been observed remaining in the nest's vicinity.<p>The band-tailed barbthroat's song is "a fast high-pitched phrase of some 5–10 notes repeated with intervals of several seconds...e.g. 'tzi-tzi-tsee-ee-tsi-tzi-tzi'." In Costa Rica the Pacific slope population has a more complex song than that of the Caribbean slope birds; it includes trills.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Tanimbar Friarbird
Philemon plumigenis
A very large, entirely gray-brown honeyeater with a long, heavy bill that is slightly downcurved, with a sharp, pointed tip and a clear nostril. Note the patch of naked skin below the eye. Found in forest, wooded areas, mangroves, and plantations within the lowlands. Restricted to the Tanimbar Islands. Larger than Tanimbar Oriole, and also distinguished by bald facial skin, flatter crown with peaked nape, more sharply pointed bill, and prominent nostril. Gives harsh “er-er” calls in addition to rollicking oriole-like song, with repetitive “E-WITCHEW” notes.
Spectacled Prickletail
Siptornis striaticollis
Small, brown bird of Andean cloud forest. Quite rare and apparently absent from many areas of seemingly appropriate forest. It has faint, pale streaking on the breast, a partial eye-ring, and a short white stripe behind the eye. Similar to Streaked Xenops, but bill is not upturned and lacks “whisker” stripes. Creeps along branches in middle levels of the forest, and often follows mixed-species flocks. Song is a quick series of high-pitched “tick” notes.
Eurasian Collared-Dove
Streptopelia decaocto
Large pale dove with a black crescent on the nape. Slightly smaller and paler than Rock Pigeon, with a proportionately longer, square-tipped tail. Favors farms and suburbs; avoids areas with extensive forests. Typically seen in pairs or small loose groups; forms larger flocks in winter. Widespread and common throughout much of Eurasia and northern Africa. Introduced to, and established in, much of North America, the Caribbean, and parts of Central America. Compare with African Collared-Dove, which may occur in small feral populations or as an escapee throughout Eurasian Collared-Dove’s range. Especially note tail pattern from below: mostly white, contrasting with the grayish undertail coverts, and with black extending down the outer edge of the tail feathers. Voice - a cooing “woop-WOOO!-woop” - is also helpful.
开始您的观鸟之旅
在户外识别鸟类，并在下一次观察时随手查阅鸟类图鉴。