This is a female. Note the faint olive wash on back, nape and face. Males and females are similar, but females average less black. This gregarious, acrobatic species ranges through the high Andes particularly in Chile where there are shrubs near water. In recent decades the New World Siskins have been moved from the genus Spinus to Carduelis to Sporagia and finally back to Spinus. See SACC Proposal 675 for details. Digiscoped with Panasonic DMC-LX5 | Nikon FieldScope III | 30XWA | hand-held (no adapter).
References:
Clement, P. (2018). Yellow-rumped Siskin (Spinus uropygialis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/61354 on 21 April 2018).
Remsen, J. V., Jr., J. I. Areta, C. D. Cadena, S. Claramunt, A. Jaramillo, J. F. Pacheco, J. Pérez-Emán, M. B. Robbins, F. G. Stiles, D. F. Stotz, and K. J. Zimmer. Version 21 April 2018. A classification of the bird species of South America. American Ornithologists' Union. http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm
Yellow-rumped Siskin (Spinus uropygialis), In Neotropical Birds Online (, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/yersis1