White-throated Magpie-Jay
Cyanocorax formosus
Spectacular, large, and often conspicuous jay of tropical lowland forests, plantations, and semiopen areas with hedges and tall trees; prefers drier areas, but locally in rather humid situations. Usually in small groups and can be surprisingly inconspicuous if feeding quietly. At other times, unavoidably noisy and impossible to overlook. No similar species in range. Note crest, white face and throat, and long white-edged tail.
识别特征
The white-throated magpie-jay is between 43 and 56 cm (17–22 in) in length and weighs 205 to 213 g (7.2–7.5 oz). The species has a particularly long tail and a slightly curved crest of feathers on the head. The crest is black in the nominate race, but has blue or white margins on the other two subspecies. The nominate race has a white face with a black crown and margin to the face, forming a narrow band around the throat, as well as a small drop below the eye. The black is less extensive in the other subspecies. The breast, belly and underside of the rump are white, and the wings, mantle and tail are blue (with whitish margins on the tail). The legs and eye are black, and the bill is grey. The plumage of the females is mostly as that of the male but duller on the top, with a narrower band across the chest, and the tail is shorter.
分类信息
The white-throated magpie-jay was formally described in 1827 by the English naturalist William John Swainson from a specimen that had been collected by the naturalist William Bullock in Temascaltepec, Mexico. Swainson coined the binomial name Pica formosa. The specific epithet is from the Latin formosus meaning "beautiful". The white-throated magpie-jay is one of two magpie-jays now placed in the genus Calocitta that was introduced in 1841 by the English zoologist George Robert Gray with the white-throated magpie-jay as the type species.<p>The white-throated magpie-jay hybridizes in Jalisco with the black-throated magpie-jay (C. colliei), with which it forms a superspecies. There are three recognised subspecies, the nominate race, which is only found in southern Mexico; C. f. azurea, which is found in south eastern Mexico and western Guatemala, and C. f. pompata, which runs from south eastern Mexico to Costa Rica.
- 学名
- Cyanocorax formosus
- 命名信息
- (Swainson, 1827)
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Cyanocorax
分布与栖息地
The white-throated magpie-jay is associated with a wide range of habitats from arid environments to semi-humid woodlands, from sea level up to 1,250 m (4,100 ft), although only occasionally higher than 800 m (2,600 ft). It occurs rarely in columnar cacti forest, but is common in thorn forest, gallery forest, deciduous woodland, forest edges and cultivated areas like coffee plantations. The species does not undertake any migratory movements, although males disperse away from their natal territories a few years after fledging. It is a common species across its range, and is not considered threatened by human activities.
- 迁徙
- Resident species
行为
White-throated magpie-jays are omnivorous, consuming a wide range of animal and plant matter. Items included in the diet include invertebrates such as insects and caterpillars, frogs, lizards, eggs and nestlings of other birds, seeds, fruits, grain, and nectar from Balsa blossoms. Younger birds take several years to acquire the full range of foraging skills of their parents.
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Northern Chestnut-breasted Wren
Cyphorhinus dichrous
Found at higher elevations than other members of its genus. Shy and uncommon denizen of forest undergrowth from 1,100–2,000 m. Chunky and short-tailed, dark brown above with rich rufous neck and breast. Blue eyering. Sexes alike. Could recall an antbird, but especially note pointier bill with a thicker base. Typically found in pairs or small family groups foraging on or near the ground. More easily heard than seen: listen for repeated sets of 2–3 eerie whistled notes stepping up in pitch, with little to no break between each set.
Medium Ground-Finch
Geospiza fortis
One of the most common and conspicuous of the Galápagos finches. Bill is at least as long as the bill is deep, with the upper edge slightly rounded. Lower edge of bill is mostly straight. Bill is moderately stout-looking, but bill size varies between individuals, and not all birds can be accurately identified. Bill is black on breeding male and dull orange on female and nonbreeding male. Male’s plumage is sooty-black; female is brown with paler underparts that are streaked with gray. Large Ground-Finch’s bill has bulbous appearance and usually forms a ridge where it meets the crown. Small Ground-Finch’s bill is smaller and more pointed. Found in a wide variety of habitats on most islands, but absent from Española and Genovesa.
South Island Saddleback
Philesturnus carunculatus
A medium-sized songbird endemic to New Zealand, confined to predator-free offshore islands and South Island mainland sanctuaries. Glossy black plumage with distinct chestnut saddle across the back, which gives the bird its name. Note the bright reddish-orange wattles on either side of the bill. Juveniles have smaller wattles and are chocolate brown for their first year. Listen for distinct calls resembling a blaring “cheeet ta-chet ta-chet ta-chet” sound. Constantly moves noisily as it restlessly forages on the floor and through the canopy. Flicks over leaves and digs into rotting logs with its strong bill in search of invertebrates. Distinguished from Eurasian Blackbird by chestnut saddle and wattles.
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