Mottled Owl
Strix virgata
A common, fairly large owl of tropical lowlands and foothills. Found in forests, woodlands, plantations, gardens, and towns. Roosts during the day at all levels in dense cover of taller trees, but at night it often hunts from low perches such as fence posts and road signs. Note the rounded head, brown eyes framed with whitish crescents on either side of the bill, and overall brown plumage that is streaked below. Varied gruff hoots can suggest a dog barking.
识别特征
The mottled owl is a medium-sized owl with adults reaching 280 to 355 mm (11.0 to 14.0 in) in length. Females are considerably larger than males; the mottled owl shows the greatest degree of sexual dimorphism of any species of owl. The crown, nape and back are mottled in several shades of darkish brown, the facial disc is pale brown and the throat, breast and belly are off-white with distinctive vertical brown streaks. The large eyes are brown, the beak is greyish-yellow or greyish-blue, and the legs and feet are greyish-yellow. There is a darker form of the bird with a buff breast and belly. Mottled owls produce a range of calls which include a hoot used in maintaining territory boundaries, and various whistles, screeches and hisses.
分类信息
The mottled owl was described by the American ornithologist John Cassin in 1849 and given the binomial name Syrnium virgatum. In 1999, Wink and Heidrich transferred it to the genus Strix, but this is still contested by some authorities.
- 学名
- Strix virgata
- 命名信息
- (Cassin, 1849)
- 目
- Strigiformes
- 科
- Strigidae
- 属
- Strix
分布与栖息地
The mottled owl is native to Central and South America. Its range extends from Mexico south to Argentina and Brazil and it is found at elevations up to about 2,500 m (8,200 ft). It inhabits a variety of wooded habitats including rainforest, woodland verges, dry thorn forest, pine/oak woodland and plantations and also open countryside with scattered trees. In some parts of its range it is common and it is often found close to human habitations. In 1983, a specimen was retrieved on the American side of the Rio Grande, thus establishing a first record for the United States. Forty years later, a mottled owl was photographed in Starr County, Texas, and there is also a 2006 record from the same state.
- 迁徙
- Resident species
行为
The mottled owl is nocturnal and spends the day in dense vegetation where it may be mobbed by other birds. Its large eyes are adapted for sight at low levels of light, and its hearing is also acute. It is a predator and at night often perches on a branch beside a glade or at the edge of woodland on the lookout for prey. When it detects a small moving object, it swoops down from its perch on silent wings and pounces on its target, which may be a small mammal, a bird, reptile or amphibian or a large beetle, grasshopper or other insect/arthropod. It is known to prey on bats.<p>The mottled owl breeds between February and May in Colombia and in September to November in Argentina. It usually nests in a hole in a tree but may also choose an empty nest built by another species. One or usually two white eggs are laid and incubated by the female and both parents care for the young.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Tongan Megapode
Megapodius pritchardii
A plump, mostly ground-dwelling bird with long yellowish legs and a dark gray body with slightly browner wash on the wings and back. Head mostly dark gray, with bright orange beak and whitish crest. Good views may show blood-red bare skin around the eye and throat. Found in mature woodland with open understory. Nests on crater lake islands. Resident, with no record of vagrancy. Very vocal, most frequently heard in groups giving chorus of loud piping whistles and shrill cries. Calls are usually a staccato one-note whistle. Unmistakable, as it is the only scrubfowl in its range.
Yellowish Flycatcher
Empidonax flavescens
Small greenish and yellowish flycatcher of humid highland forests. Usually found singly, at all levels inside the forest and at edges, sallying for insects. When perched, often flicks tail upwards. Note the peaked crest, teardrop-shaped eyering, overall plumage coloration, and very high-pitched call and song phrases. Range does not overlap with very similar Pacific-slope and Cordilleran Flycatchers, but compare with migrant Yellow-bellied Flycatcher that occurs mainly in lowlands and has a distinctly different call).
Sierra Nevada Brushfinch
Arremon basilicus
Shy and skulking brushfinch restricted to cloud forest in Colombia’s Santa Marta Mountains. Quite distinctive in its limited range, with a black face and breast spot, white throat, and striped head. It stays low in the understory and is often hard to see, but sometimes visits feeders within El Dorado Nature Reserve, where it can be easier to find. Song is a long series of high-pitched squeaks and trills.
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