Collar choke
| Collar choke | ||||||||||||
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Collared Thrush ( Ixoreus naevius ), female |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Ixoreus | ||||||||||||
| Bonaparte , 1854 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Ixoreus naevius | ||||||||||||
| ( Gmelin , 1789) |
The varied thrush ( Ixoreus naevius ) is a kind from the family of thrushes (Turdidae), which only in the Nearctic occurs. It is the only species in the monotypic genus Ixoreus . There are four subspecies. The IUCN classifies them as least concern .
description
The collar thrush reaches a body length of 23 to 28 centimeters. The wingspan is 38 to 42 centimeters. The weight varies between 75 and 85 grams. The legs and feet are matte pink.
The males have a black, almost purple shimmering head and neck in their magnificent dress . A broad, bright orange-brown stripe over the eyes runs from the eye in a semicircle to the base of the neck. The forehead is black. A black, wide stripe runs from the base of the beak over the eyes. The beak is dark gray, the iris is dark brown. The throat and front chest are orange-brown, with a wide, black chest band in between. On the underside of the body, the orange-brown continues to lighten in the direction of the rump, so that the rump and the under tail-coverts are almost white. The tail is black-purple.
The females are generally a little more dull in color than the males. The eye line is pale purple-black, the chest band is more gray than black, and the underside of the body is paler than in the male. Young birds are similar to the females, but are even paler in color.
Distribution area
The breeding area of the collar thrush extends in western North America from Alaska to northern California . It is only absent in the extreme north and on the northwestern Pacific coast. The collar thrush prefers moist forests and forest edges as a habitat. But it also occurs in wetlands and the tundra . It is a migratory bird and the northern populations overwinter in more southerly areas of the range in the western United States. Southern populations often show unsteady migratory movements during and in winter, and in some cases they only leave high altitudes.
Way of life
The collar thrush eats insects, seeds and fruits. Maple seeds play a larger role in the food spectrum of overwintering birds.
In the winter months, collar thrushes can occasionally be seen in loose groups. During the breeding season, however, the males are territorial and indicate their territorial ownership by singing, among other things. Collared chokes enter into a monogamous seasonal marriage.
The nest is usually built in forks of branches and is high above the ground. According to the current state of knowledge, the female alone builds the nest. It uses twigs, bark, and grass for nest building. The nesting trough is covered with finer grass. The clutch usually consists of three to four pale blue eggs. These are either unmarked or lightly brown speckled. The incubation period is 14 days. The female breeds alone. Both parent birds are involved in the rearing; The young birds are hacked only by the female. The young birds can fledge at 13 to 15 days.
Subspecies
- Ixoreus naevius carlottae ( AR Phillips , 1991)
- Ixoreus naevius godfreii ( AR Phillips , 1991)
- Ixoreus naevius meruloides ( Swainson , 1832)
- Ixoreus naevius naevius ( Gmelin , 1789)
swell
literature
- Richard Sale: A Complete Guide to Arctic Wildlife. Christopher Helm, London 2006, ISBN 0-7136-7039-8 .
Individual evidence
Web links
- Ixoreus naevius inthe IUCN 2013 Red List of Threatened Species . Listed by: BirdLife International, 2012. Retrieved December 23, 2013.
- Collar thrush feathers