Helmet Vanga
Euryceros prevostii
Huge black vanga with a rufous back and an enormous blue bill. Rare and localized Madagascar endemic that is found in northeastern rainforest at low and middle elevations. Usually in the mid-story, perching motionless for long periods. Often joins flocks with other large vangas. Most easily located when nesting in a large mossy cup that is placed on a forking mid-story branch. Song is a long, delicate, high-pitched, slightly descending trill.
识别特征
The helmet vanga is a large vanga, the second-largest species of vanga after the sickle-billed vanga. In length it measures 28 to 31 cm (11–12 in), and it weighs 84 to 114 g (3.0–4.0 oz). The most distinctive feature is the massive hooked bill, which is 51 mm (2.0 in) long and 30 mm (1.2 in) deep. The plumage of the head, neck, throat, breast and belly is a solid blue-black, as are the primary coverts and remiges of the wing. The mantle, the back, and the rest of the wings are rufous. The tail, which is long and broad, is black below and rufous above. The bill is bright blue with a black tip. Both sexes are alike.
分类信息
The helmet vanga is the only member of the genus Euryceros. Like most vangas it was originally placed in the shrike family, Laniidae. When the ornithologist Austin L. Rand moved the majority of the vangas into a separate family in 1936, he placed the helmet vanga in its own monotypic family, Eurycerotidae. It was moved to the vanga family by J. Dorst in 1960. The closest relative within the family is believed to be the rufous vanga, which is thought to have split from the helmet vanga 800,000 years ago. The specific name prevostii commemorates the French artist Florent Prévost.
- 学名
- Euryceros prevostii
- 命名信息
- Lesson, RP, 1831
- 目
- Passeriformes
- 科
- Vangidae
- 属
- Euryceros
分布与栖息地
It is restricted to lowland and lower montane rainforests in north-eastern Madagascar. Sites where it can be found include Marojejy National Park, Makira Natural Park, the Masoala National Park and Mantadia National Park.
- 迁徙
- Resident species
行为
Adults mainly eat large insects, but food items brought to young in the nest may be more varied, including snails, lizards, spiders and crabs.<p>Helmet vangas are monogamous and seasonal breeders. The breeding season runs from October to January on the Masoala Peninsula. Both sexes work on the construction of the nest, which is a cup shape 15 cm (5.9 in) in diameter constructed from woven plant fibres, mosses and twigs, and is placed in a fork in a tree 2 to 4 m (6.6–13.1 ft) off the ground. There is one record of courtship feeding by a male before copulation. The clutch size is two or three pinkish white eggs.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
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