Olive-crowned yellowthroat
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Olive-crowned yellowthroat ( Geothlypis semiflava ) |
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| Geothlypis semiflava | ||||||||||||
| Sclater , 1860 |
The olive-crowned yellow throat ( Geothlypis semiflava ) is a small songbird from the genus yellow throats ( Geothlypis ) in the wood warbler family (Parulidae). It occurs in Central America and South America . The Kentucky warbler ( Oporornis formosus ) is genetically very similar . The IUCN lists them as “not at risk” (least concern).
features
Olive-crowned yellow throats reach a body length of 13.5 centimeters and weigh around 17 grams. The wing length is 5.6 to 6.1 centimeters in the male, 5.5 to 6.2 centimeters in the female. Adult male olive-crowned yellow throats of the nominate shape have a striking black face mask that extends to the sides of the neck and the ear covers. In contrast to other yellow throat species, however, they lack the forehead corolla band. The rest of the head plumage is light olive green. The wings are dull brown with olive feather edges. The upper side plumage is also light olive green; the underside plumage light yellow, with faded olive flanks and sides of the chest. Her legs are flesh-colored; the beak blackish. Adult females of the nominate form have an olive-green head and upper side plumage and a light yellow lower side plumage as well as a short olive-yellow superciliar stripe and a little olive-yellow eye ring.
Male juveniles in the first year differ in the less pronounced face mask, which is limited only to the sides of the head. Females in the first year have a darker plumage and a noticeable lighter underside plumage. Juveniles have olive-brown head and upper plumage and light, yellow to buff-colored lower plumage.
The appearance of the subspecies Geothlypis s. bairdi differs only slightly from the nominate form. The beak is a little longer; the tail feathers are a little shorter.
Occurrence, nutrition and reproduction
The distribution area extends from Central America to South America. Olive-crowned yellow throats inhabit dense bushes at the edges of forests, clearings and bush-like damp landscapes, among other things, at roadsides and often near bodies of water. They mainly feed on insects and other invertebrates . It is incubated from April to June. They build their deep, bowl-shaped nest well hidden in a grass hollow or in the thick undergrowth. A clutch usually consists of two eggs. There are no studies on the incubation and nestling time.
Subspecies and distribution
There are two recognized subspecies:
- Geothlypis s. semiflava Sclater , 1860 - Western Colombia to southwest Ecuador
- Geothlypis s. bairdi Ridgway , 1884 - From eastern Honduras via Nicaragua , Costa Rica to northwestern Panama
swell
literature
- Jon Curson, David Quinn, David Beadle: New World Warblers. Helm, London 1994, ISBN 0-7136-3932-6 .
Web links
- Geothlypis semiflava in the endangered Red List species the IUCN 2008. Posted by: BirdLife International, 2008. Accessed on 3 February, 2009.
- Olive-crowned yellow throat at ITIS