Chouette rayée

Identification

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.

Taxonomie

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.

Nom scientifique

Strix virgata

Autorité

(Cassin, 1849)

Ordre

Strigiformes

Famille

Strigidae

Genre

Strix

Répartition et habitat

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.

Migration

Resident species

Comportement

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.

Conservation

Tendance de la population

declining