Piapiac
Ptilostomus afer
A unique, slender magpie-like bird with a long narrowing tail and a chunky bill. Adults are uniform glossy black; immatures have black-tipped pink bills. Resident in open savanna with palms, in cultivated areas, and in rural villages. Forages on the ground in groups, often near larger mammals including domestic stock, walking on the ground or riding on the back of the mammal. Also perches in treetops and palms when roosting or resting. Loaded with character. Groups sometimes become garrulous when calling to each other, mostly giving piping high-pitched starling-like “cheeet” calls.
识别特征
In size it is a little smaller and slimmer than the European magpie (Pica pica) though the bill is relatively thicker. It is 35–42 cm (14–17 in) in length and weighs 121–130 g (4.3–4.6 oz). The overall colouring is black with the feathers quite silky in texture and having a purplish gloss in good light. The base of the tail tends to be more brown in colour than the rest of the body. Unusual for a passerine it has 10 rather than 12 tail feathers. The nasal plumes are somewhat upturned on top of the bill but fully cover the nostrils. The bill itself is black in the adult but partly reddish-pink towards the base in juvenile specimens. The bird's legs and feet are black and the iris is variable, but tends towards violet, purple or mauve with a bluish-purple outer ring. The voice is usually described as a shrill squeaking often with the jackdaw-like overtones. There is also a croaking alarm call given in anger where the head bobs.
分类信息
In 1760 the French zoologist Mathurin Jacques Brisson included a description of the piapiac in his Ornithologie based on a specimen collected in Senegal. He used the French name La pie du Sénégal and the Latin Pica Senegalensis. Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. When in 1766 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the twelfth edition, he added 240 species that had been previously described by Brisson. One of these was the piapiac. Linnaeus included a brief description, coined the binomial name Corvus afer and cited Brisson's work. The specific name afer is Latin for "Africa". The piapiac is the only species placed in the genus Ptilostomus that was introduced by the English naturalist William John Swainson in 1837. The species is monotypic.<p>A molecular phylogenetic study published in 2005 found that the piapiac from Africa was most closely related to the ground jays in the genus Podoces that inhabit Central Asia.
- 学名
- Ptilostomus afer
- 命名信息
- (Linnaeus, 1766)
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Ptilostomus
分布与栖息地
The range of the species is the tropical equatorial region of central Africa from Senegal on the west coast, eastwards in a broad band to Sudan and southern Ethiopia. Within this range, its favoured habitat is towards more open country of cultivated land with fields and pasture and small associated towns and villages.
- 迁徙
- Resident species
行为
Food is obtained in flocks of ten or more birds moving together on the ground including insects and other invertebrates but will take a degree of carrion, possibly attracted as much by the associated insects this attracts as much as the meat itself. Some fruit is also taken in trees with the oily fruit of the oil palm Elaeis guineensis a favourite. Able to run fast with some agility, it tends to hop at slower speed and will catch insects disturbed by the feet of cattle, sometimes hitching a ride on their backs and darting out to catch the prey.<p>The piapiac often nests in a palm tree, but other nesting sites are also used. Strips of palm leaf and grass stems are cemented together with mud and lined with palm fibre to form a cup, in which three to seven eggs are laid between March and April. Piapiac eggs are very pale blue, or greenish-blue with a few brown blotches.
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Olive-backed Foliage-gleaner
Automolus infuscatus
Dark brown foliage-gleaner of mature rainforest understory. Warm dark brown body, with a clean whitish throat patch and reddish brown tail. Does not have prominent reddish brown in the wings like many other foliage-gleaners do; the clean whitish throat, plain face (without a strong eyebrow) and habit of foraging low are other good distinguishing features to tell it apart from other foliage-gleaners. Primarily found in the understory of mature rainforest. Listen for its song, a musical trill with stuttered introductory note, “ch-trrrrrrrr”, similar to that of Chestnut-crowned Foliage-gleaner from denser secondary growth habitats, but slightly lower and with a more distinct introductory note.
Finn's Weaver
Ploceus megarhynchus
Range-restricted weaver with a powerful dark bill. Male is predominantly yellow with a dark cheek patch. Female is streaky brown above and paler below; lacks the strong streaking and facial patterns of Streaked and Black-breasted Weavers. Female Finn’s is similar to female Baya Weaver, but note the darker coloration, lack of a pale brow stripe, and heavier, sharper-looking bill in female Finn’s. Inhabits open areas with scattered trees; favors wet areas. Colonial nester; males build ball-shaped nests, often in cotton trees.
Rufous-breasted Sabrewing
Campylopterus hyperythrus
Large, conspicuous hummingbird of tepui highlands. Green above and rufous below. Note extensively rufous outer tail feathers, which are easily seen as birds tend to flare tail frequently. Generally common at higher elevations (above 1000 m), especially at forest edge and in lower-stature, scrubby vegetation. Feeds on nectar and pugnaciously defends patches of flowers against other hummingbirds. Not shy and will approach to investigate observers. In territorial interactions, gives a rich, sharp note, often doubled, repeated incessantly, and similar to calls of more widespread Gray-breasted Sabrewing; also gives a single, ascending, burry note, possibly as an alarm call. No other hummingbird in highland range is as large or shows as much rufous.
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