Izu Thrush
Turdus celaenops
Handsome songbird found only on Izu, Tokara, and a few other islands off the coast of Japan, where fairly common, most abundant in broadleaf evergreen forests. Male orange-brown above, rich orange below, with black hood, yellow bill, and yellow eyering. Female lacks male’s hood and intense colors; very similar to female and young Brown-headed Thrush but has extensive black spotting on the undertail coverts. Song recalls Japanese Robin’s.
识别特征
The Izu thrush is about 23cm long. Their back and tails are black and they have a yellow eye-ring and bill, brown wings, and a rust-red chest. The males have darker plumage than that of the females.
分类信息
- 学名
- Turdus celaenops
- 命名信息
- Stejneger, 1887
- 目
- Passeriformes
- 科
- Turdidae
- 属
- Turdus
分布与栖息地
The Izu thrush is an endemic bird of Japan. Most are on the Izu Islands. On Izu Ōshima, Miyakejima and Mikurajima they sing two syllables. The song of the population ofHachijojima 90 km south sounds entirely different with one syllable. On their last island of the chain Aogashima they have more syllables.Some less densely populated are on the Tokara Islands Yakushima, Kuchinoshima, Nakanoshima, Tairajima, Akusekijima and Takarajima. On Nakanoshima the song is composed of more syllables. In addition, there are wintering records from Shizuoka, Chiba, Mie and Wakayama Prefectures.
- 迁徙
- Resident species
行为
Izu thrushes eat small animals, such as earthworms and insects, and fruits, like cherries or mullberries.<p>The Izu Thrush's breeding season is March to July. During the first half of this season, the male will sing at dawn, but will, during the second half, sing throughout the day. One source described their song as 'kyurrr, chotts' and their call as 'tweet' or 'chat, chat, chat". They build their nests in trees about half a metre from the ground. They use soil to bind the materials, such as grass and moss, together. While the clutch can have as many as five or as few as two eggs, most clutches are of three to four eggs. The eggs are blue with brown spots and are roughly 3cm long. Both parents look after the chicks.<p>Since the introduction of weasels, the fledgling rate has significantly decreased.
保护状况
The izu thrush is described as a vulnerable species by the IUCN Red List. There are between 2500 and 9999 thousand mature individuals and the population is decreasing, though it is not severely fragmented. The amount and/or quality of their habitat is decreasing. They are threatened by volcanoes, roads, railroads, wood plantations, tourism areas, and both native and invasive species and diseases.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Saffron Toucanet
Pteroglossus bailloni
Unmistakable yellow toucan with a long two-toned bill: half red and half greenish-yellow. The iris is pale and framed with bare red skin. Also note the red rump. Usually seen in the canopy of humid and second growth forests in small groups, sometimes descending to visit feeding stations.
Woodland Kingfisher
Halcyon senegalensis
A medium-sized, electric-blue-backed kingfisher with a distinctive bicolored bill: red above and black below. Pairs and singles mostly hunt insects in taller dry woodland, riverine forest, and forest edges. Its loud and characteristic call is a high-pitched “tuuui”, followed by a pause and then a trilling, down-slurred “trrrrrrrrrrrrrrrrr”. Sometimes it advertises by sitting upright, extending its wings to show a bold wing pattern, and calling. Almost all of Africa’s other similar kingfishers have a uniformly red-orange (not bicolored) bill, except the Blue-breasted Kingfisher, which differs by being larger, having a complete pale-blue breast band, and preferring denser lowland rainforest.
Gray Wren-Warbler
Calamonastes simplex
A very dark, long-tailed warbler of dry country. Blackish-gray overall with a reddish eye and white tips to the tail. With a good look, barring on the throat, belly, and vent may be visible. The tail is frequently cocked up. Generally common in dry thorn savanna and thornscrub. Usually stays in the understory, but will sing from the tops of bushes and small trees. Similar in shape to Miombo Wren-Warbler, but much darker, with virtually no overlap in range. The main vocalization is a loud “chup,” repeated about once per second.
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