Scaly Ground-Roller
Geobiastes squamiger
Chunky, long-legged, intricately patterned bird. Pale blue tail tips are conspicuous in flight. Elusive and uncommon; unlikely to be seen by those not searching for it. Found at low and middle elevations in eastern rainforest. Feeds in the understory, avoiding disturbance by fleeing on the ground. Song is a long “bwooooop” note that is repeated slowly, delivered from a low perch.
分类信息
This species taxon has been referred to by several other synonymous names until recently, including the following binomial names:<p>Until the 2000s, the taxon was called Brachypteracias squamigera, in the genus Brachypteracias. The scaly ground roller, Geobiastes squamiger, is in the monotypic genus Geobiastes, however was originally placed in the genus Brachypteracias in 1838 by Frédéric de Lafresnaye. The species was moved to Geobiastes to reflect its unclear phylogenetic relationship with the sister taxon to its family Brachypteraciidae, Brachypteracias leptosomus. The scaly ground roller also has a different tarsometatarsus to hallux measurement ratio compared to the genera Brachypteracias, Uratelornis, and Atelornis, where the scaly ground roller has a smaller ratio (2.8) compared to the other genera (4.5). An enlarged tarsometatarsus may be a derived character in the family Brachypteraciidae.
- 学名
- Geobiastes squamiger
- 命名信息
- (Lafresnaye, 1838)
- 目
- Passeriformes
- 科
- Turdidae
- 属
- Geobiastes
分布与栖息地
- 迁徙
- Resident species
行为
The diet of the scaly ground roller mostly consists of invertebrates it collects from the ground but it does also eat vertebrates it can find. It has been reported to chiefly eat earthworms (Pheretima sp.) and centipedes (Scolopendra morsitons), but spiders, frogs, lizards (Zonosaurus sp. and Phelsuma sp.), and tenrecs (Microgale sp.) have also been reported to be eaten by the ground roller.<p>Nesting occurs in small burrows, ranging from 6.5 to 10 cm (2.6–3.9 in) wide and 55 to 77 cm (22–30 in) deep. The nests are generally found near sources of water and where there's great herbaceous ground coverage. The scaly ground roller lays its eggs from mid-October to early November, with a clutch size of one egg. Incubation is conducted solely by the female for a period of 18 days. During brooding, the female generally will remain with the egg while a male brings food to the nest. Both parents provide food for their young after hatching.
保护状况
The scaly ground roller is threatened by habitat loss and is considered by IUCN to be a vulnerable species. Although threatened by removal of its ecological niche, it is more resilient to climate change and forest conversion effects than other similar species. Climate change can result in further loss of its habitat. It may also face risks from human hunters and domesticated dogs.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
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Unmistakable bird of mature lowland rainforest. Spherical black body with bold white wing patch perched on long legs, yellow bill. A fairly large bird, about the size of a chachalaca or small turkey. Highly social, and usually found in family groups of several individuals meandering through mature rainforest on the forest floor. Now rare in many areas due to hunting, but can be fairly common in more remote areas. Makes sharp “chack” calls and low booming notes. Sometimes follows army ant swarms or monkeys, and roosts in trees at night.
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