Yellow-Bellied Siskin
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The yellow-bellied siskin (Spinus xanthogastrus) is a small passerine bird in the finch family Fringillidae. It breeds from Costa Rica south to southern Ecuador, central Bolivia and the highlands of northwestern Venezuela.
The yellow-bellied siskin breeds in mountain oak forests at altitudes between 800–3,000 m. The nest is a shallow cup of rootlets, bark and lichens 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 not migratory, this species wanders within its range when not breeding.
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 sharp pyee.