Broad-tailed Hummingbird
Selasphorus platycercus
Common hummingbird of high elevations. Breeds in open woodland with meadows and scrub. In winter, found at lower elevations. Male is distinctive in range with beautiful rosy-red throat and glistening green upperparts. Female is duller with buffy sides and speckled throat. Note broadly rounded tail feathers with restricted rufous. Feeds on nectar and small insects. Visits feeders.
识别特征
Medium in size, the broad-tailed hummingbird is 4 inches (10 cm) in length and possesses an overall wingspan of 5.25 inches (13.3 cm). Weighing around 3.6 grams (0.13 oz), the female tends to be slightly larger than the male. Adults of both sexes show an iridescent green back, white eye ring and a rounded black tail projecting beyond their wing tips, from which their name was inspired. <p>This species shows sexual dimorphism, which means that male and female have different characteristics. The male possesses a characteristic bright rose-red gorget. An identification characteristic is the white eye ring. The female can be distinguished from the male by her paler coloration, cinnamon flanks, and spotted cheeks absent in the male.<p>The broad-tailed hummingbird produces several different sound patterns. This bird's call sounds like a sharp “cheet”, which is repeated “cheet cheet cheet cheet...”. Hummingbird wing beats have also been found to be a communication signal. These birds produce two different types of sound using their wing beat. The first one is a “wing hum” and is simply produced when the hummingbird flies. This type of wing beat has a sound that ranges from 35 to 100 Hz, and both sexes are able to produce it for communication. The second is “wing trills” produced by the male hummingbird during courtship displays. The wing trill produces a buzzing sound and can be heard 50 m away by other males and 75 m away by other females. This sound is produced when air passes rapidly through the 9th and 10th primary feathers. In one experiment, birds without this wing trill lost their territory more easily to more aggressive birds.
分类信息
The broad-tailed hummingbird, Selasphorus platycercus, is a member of the order Apodiformes, in the family Trochilidae. Hummingbird taxonomy has not been extensively studied, but its phylogenic division can be divided as a family into nine clades in which the broad-tailed hummingbird is a member of the "Bee group" and included in the Selasphorus genus. This genus is composed of 6 members taxonomically distinguished based on color characteristics. This genus is characterized by hummingbirds with a plumage containing rufous coloration and a neck gorget of orange to purple in males.<p>Members of this genus include:<p>Selasphorus sasin : Allen's hummingbird<p>Selasphorus rufus : Rufous hummingbird<p>Selasphorus scintilla : Scintillant hummingbird<p>Selasphorus ardens : Glow-throated hummingbird<p>Selasphorus flammula :Volcano hummingbird<p>On a geographic scale, the genus Selasphorus can be subdivided into 2 groups of species, one living in North America, and a second in the region of Costa Rica and Panama.
- 学名
- Selasphorus platycercus
- 命名信息
- (Swainson, 1827)
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Selasphorus
分布与栖息地
The broad-tailed hummingbird is found from Guatemala to Mexico, and western United States and Western Canada during summer, while wintering regions are mainly in southern Mexico and Guatemala.<p>This species exhibits partial migration, depending on the northern range during winter. The specific migratory route used by the broad-tailed hummingbird remains unknown, although migrating populations winter in southern Mexico or Guatemala and return to their breeding area in spring. Males arrive first to the breeding range, followed by breeding females. Some populations of the broad-tailed hummingbird in southern Mexico and Guatemala do not migrate, a variation in behavior called "sedentary". This hummingbird is seen in the understory or under tree canopies of pine and oak woodland. It forages in open areas with flowers or in grasslands among trees and shrubs. Its breeding habitat is mainly in subalpine meadows, foothills, montane valleys, and stands of aspen or spruce.
- 繁殖区
- NA : wc USA, Mexico and w Guatemala
- 非繁殖区
- MA
- 迁徙
- Complete migrants
保护状况
This species conservation status is “Least Concern ”, indicating it is not an endangered species, having a wide range and moderate population size, although one survey indicated a 52% decline in population between 1966 and 2015. It appears to be adapted to human-modified habitats.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
White-eared Solitaire
Entomodestes leucotis
Beautiful, boldly patterned bird of montane forest. Reddish brown above, black below, with a black head, broad white mustache, and coral red bill. Perches upright in the mid-story and canopy of humid forest and forest edge. Listen for its distinctive song, an even-pitched, rusty wheeze “zzeee,” repeated every 10-20 seconds.
Indian Nightjar
Caprimulgus asiaticus
Cryptically-colored nightbird. Note white “moustache” streak, golden-brown collar, and pointed buff-and-black feathers above the wing. Much more intricately marked than Large-tailed Nightjar; also lacks white throat of that species. Not as diffusely patterned as Savanna and Jungle Nightjars, both of which lack Indian’s white “moustache” and clear collar. Male shows bright white patches near the wingtips and on the tail-tips in flight. Found in a range of wooded habitats, from hilly dry forest to garden edges. Listen for its distinctive song, an accelerating knocking akin to a ping-pong ball dropping and bouncing rapidly on the floor.
Long-legged Buzzard
Buteo rufinus
A large, long-winged buzzard which may recall a small eagle in size. Variable plumage with three color morphs. All have obvious dark carpal patches at the wrist of the wing. Juveniles lack the adult’s prominent black trailing edge to the wings. Often hunts from a prominent perch, or sits on the ground and scans for prey. A species of open steppe and desert country, sometimes in more wooded areas but always near big open spaces. Compare with similar Common and Upland Buzzards, as well as Rough-legged Hawk; note long-winged structure, size, and wings held in “V” in soaring flight.
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