Yellow-rumped Siskin

The yellow-rumped siskin (Spinus uropygialis) is a species of bird in the family Fringillidae, the finches and euphonias. It is found in Argentina, Bolivia, Chile, and Peru. == Taxonomy and systematics == The yellow-rumped siskin was originally described in 1862 with the binomial Chrysomitris uropygialis. It was later moved to what was then the subgenus Spinus within genus Carduelis and also spent time in genus Sporagra. Beginning in about 2009 the subgenus was elevated to full genus level and the yellow-rumped siskin, the rest of the New World siskins, and the New World goldfinches were therefore elevated to now-genus Spinus. The yellow-rumped siskin is monotypic. It is believed to hybridize with the hooded siskin (S. magellanicus) in Peru. == Description == The yellow-rumped siskin is 12 to 14 cm (4.7 to 5.5 in) long; one individual weighed 14 g (0.49 oz). The species is sexually dimorphic but not dramatically so. Adult males have a sooty black head, neck, throat, and upper breast. Their back is sooty black, their rump bright yellow, and their uppertail coverts blackish with wide yellowish edges. Their tail is mostly black with wide yellow edges at the bases of the outer feathers. Their wings' greater coverts…