Topknot Pigeon
Lopholaimus antarcticus
A large solid pigeon with a unique waved crest on the back of the head. Almost entirely gray with darker wing feathers. Tail is dark gray with a broad pale band. Typically seen feeding on fruit high in rainforest canopy trees. Also, often observed flying in large flocks at high altitudes over other habitats – look for the banded tail in flight.
识别特征
The topknot pigeon is a large predominately slate-grey bird, 40–46 centimetres (16–18 in) in length. The back, coverts and upper secondaries are a darker slate-grey with black quills. The primaries are black, the remaining body in a lighter slate-grey in colour. The chest and hind neck are notched, showing dark bases giving a streaked appearance.[2] The tail is black crossed with a board grey band. The crest is grey from the cere to the forehead, and russet brown on the crown with black sides. The mandibles are red with a brown tip, the protuberances at the base of the mandibles are bluish-green. The tarsals and feet are purplish red. The sexes are similar in description. However, Males have larger crest and lack some of the streaking on the chest. Juveniles are like females but the chest is mottled not streaked, the crest is smaller, with the cere and forehead being light brown, the crown grey. Tarsals and feet are reddish brown. The iris is yellow-golden with a bright red outer band. In fledglings the iris is brown.[2]
分类信息
English naturalist George Shaw described the topknot pigeon as Columba antarctica in 1793.<p>The topknot pigeon is sister taxon to a lineage that gave rise to the mountain pigeons (Gymnophaps) of New Guinea, the common ancestor of both diverged from a lineage that gave rise to the kererū and Chatham pigeon.<p>"Topknot pigeon" has been designated the official common name by the International Ornithologists' Union (IOC); John Gould noted in 1848 that it had been given this name by the colonists of New South Wales. It is also known by the name of "flock pigeon".
- 学名
- Lopholaimus antarcticus
- 命名信息
- (Shaw, 1793)
- 目
- Columbiformes
- 科
- Columbidae
- 属
- Lopholaimus
分布与栖息地
Found from the Cape York Peninsula in Queensland to the central south coast of New South Wales. These pigeons cover great distances in search of fruit bearing trees suddenly appearing in areas where they have not been seen for many years and will occasionally move beyond their normal southern range limit, into eastern Victoria.[2] Historic records from 1953 show the topknot pigeon as an "accidental" species to Tasmania with a specimen taken at Spreyton near Devonport. This bird was one of a flock of 9-10 birds feeding on cherries. Previous to this sighting, the only other recording was in 1907 when two specimens were taken near St. Helens, east coast of Tasmania. The Spreyton specimen is held in the Tasmania Museum, Collection Number 13184/B2703.
- 迁徙
- Nomadic movement
保护状况
The species used to occur in enormous numbers in Australian rainforest, but the population declined because of forest clearance and shooting. Because of concern over the steep decline in their population, topknot pigeons now are a protected species in Australia. However the increasing prevalence of a new food source in the fruit of the 'weed' camphor laurel trees has seen a recent resurgence in their number.[citation needed] As populations appear to be fluctuating but large, the species is currently classified as Least concern by the IUCN.
- 种群趋势
- declining
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其他鸟类
Chestnut-breasted Cuckoo
Cacomantis castaneiventris
Small cuckoo with deep orange-brown underparts, gray upperparts, barred undertail, and a yellow eyering. Typically inhabits dense rainforest habitats. Secretive; most easily located when calling. Plumage similar to Fan-tailed Cuckoo but smaller, more richly colored. Call is a piercing, descending trill, similar to that of Fan-tailed.
Green-striped Brushfinch
Arremon virenticeps
Fairly stocky, sparrowlike bird endemic to highland forests. Occurs mainly in fir and humid pine-oak forest understory, often in brushy flower banks and shady canyons, where typically skulking and difficult to see well. Feeds on and near the ground, usually in pairs. White throat stands out in shady understory, but green head stripes can be difficult to see. Range does not overlap rather similar Chestnut-capped Brushfinch.
Flammulated Pygmy-Tyrant
Hemitriccus flammulatus
A small and nondescript flycatcher that is nowhere near as exciting-looking as the name suggests. Generally found in large bamboo thickets, but can also occur in other viney tangles in forest gaps and edges. Overall dingy olive upperparts and faintly streaked brownish underparts are fairly distinctive; most similar species in range are either yellower or grayer, not brownish. Most often found by its voice, a short series of hollow “pip” notes.
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