| Yellow-bellied siskin | |
|---|---|
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Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Fringillidae |
| Subfamily: | Carduelinae |
| Genus: | Spinus |
| Species: | S. xanthogastrus |
| Binomial name | |
| Spinus xanthogastrus (Du Bus de Gisignies, 1855) | |
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| Synonyms | |
Carduelis xanthogastra | |
Theyellow-bellied siskin (Spinus xanthogastrus) is a smallpasserinebird in thefinch family Fringillidae. It breeds fromCosta Rica south to southernEcuador, centralBolivia and the highlands of northwesternVenezuela.
The yellow-bellied siskin is a small bird, 10.5 cm in length and weighing 12 g. The male is entirely black except for a bright yellow belly, tail sides and wing patches. The female is dark olive green above and has pale yellow underparts which become brighter on the belly. She has a blackish tail and wings and also has bright yellow primary wing patches and tail sides. Young birds resemble the female, but have dusky fringes to the upperpart feathers and smaller yellow wing and tail patches. The song of this bird is a pleasant chattering twitter, and the call is a sharppyee.
The subspeciesS. x. stejnegeri, which occurs from extreme southeasternPeru to central Bolivia, is larger and longer-billed than the nominate subspeciesS. x. xanthogastrus. Males have larger yellow wing patches and more extensive black on the flanks. Females of this subspecies are darker olive above than the northern birds.
The yellow-bellied siskin is more of a woodland bird than the superficially similarlesser goldfinch (Spinus psaltria) and the latter species is paler and has a white wing patch and a more musical song.
The yellow-bellied siskin breeds in mountainoak forests at altitudes between 800–3,000 m. The nest is a shallow cup of rootlets, bark andlichens 2.4–3.7 m high in the dense foliage of a small tree in a clearing. The two or three green-tinged white eggs are laid in April or May and incubated by the female. Although notmigratory, this species wanders within its range when not breeding.
The yellow-bellied siskin has been relentlessly persecuted for the cage-bird trade in some areas, such as centralCosta Rica. Where it remains common, in remote or protected areas, flocks of up to 30 birds forage in the canopy for smallinsects and oak flowers, or descend to clearings for seeds. The males may sing socially.
