Cobb's Wren
Troglodytes cobbi
Endemic to the Falkland Islands, where it is found in seashore areas and offshore islets, typically in association with tussac grass. Often forages on rocky beaches, picking at food items washed up by the tide. Somewhat similar House Wren has wandered to the Falklands before, but note present species’ gray-brown head and neck, lack of a prominent eyering, and longer darker bill. Can be tame and confiding, allowing close approach. Rattling song, somewhat similar to that of House Wren, can be given from an exposed perch or deep in cover. Calls include nasal mews and harsh, dry churrs and rattles.
识别特征
The plumage is brown, greyer on the head and breast and more rufous on the tail. There are dark bars on the flight feathers and tail. The bill is long, blackish and slightly curved. The main confusion species is the grass wren which is smaller with a shorter bill, buff eyestripe and dark streaks on the back and head. Cobb's wrens have a number of buzzing calls and their song is a series of jumbled trills and whistles. The song can be heard from August to February and varies between individuals with different males having different song patterns.
分类信息
- 学名
- Troglodytes cobbi
- 命名信息
- Chubb, C, 1909
- 目
- Passeriformes
- 科
- Troglodytidae
- 属
- Troglodytes
分布与栖息地
- 迁徙
- Resident species
行为
The birds typically inhabit dense stands of tussac grass near the coast. They are often found on beaches searching among kelp and debris to find small invertebrates such as insects and amphipods. They are tame and can often be approached closely. When disturbed they prefer to slip away like a mouse between boulders or tussac clumps rather than fly.<p>The nest is a ball of grass lined with feathers and tussac root fibres. It is built on or near the ground among tussac or in a rock crevice. The eggs are pinkish with small reddish spots, three or four are laid in a clutch. The eggs are laid from early October to December and two broods are probably raised during the breeding season.
保护状况
This wren is restricted to small rat-free islands with a population of only 4,500-8000 pairs (1997/1998 estimate). It is fragmented into small populations which could disappear if their islands were colonized by rats or cats. The birds' habit of feeding and breeding at ground level makes them very vulnerable to predation unlike the grass wren which lives higher up and can coexist with predators.<p>The plight of Cobb's wren was recently brought to broader attention by being featured as Canon's endangered species of the month for the February 2009 issue of National Geographic Magazine.<p>It has been reclassified as least concern in 2017 by the IUCN thanks to the control of invasive rats on nearby islands.
- 种群趋势
- stable
照片
分布
鸟叫声
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Glossy black myna with bright yellow head wattles. Also note bright candlewax-orange bill and white wing patches that are most apparent in flight. A species of mature humid forest and forest edge, often seen in pairs or small flocks flying between or perched up in tall trees. Famed for its wide repertoire: gives a myriad of screams, squeaks, chirps, and whistles. Threatened by its popularity in the cage bird trade.
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