Upwards of 25 subspecies have been recognized for this common widespread neotropical sparrow. This is presumably the race Z. c. australis found in the Santiago Andes south to Patagonia. It is larger than other races, lacks crown stripes, and has longer wings. It is one of the few subspecies that is migratory, moving north as far as Bolivia after nesting. This strong migration might be used in argument about a controversial record of this species in Colorado in 2011 which may or may not have been a naturally occurring vagrant. However, the Colorado bird appears to have been of a different race. Canon SX50 HS.
References:
Floyd, T., 2011. A Worthy Bird. ABA Blog.
Rising, J. & Jaramillo, A. (2018). Rufous-collared Sparrow (Zonotrichia capensis). 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/61910 on 18 April 2018).
Rufous-collared Sparrow (Zonotrichia capensis), 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/rucspa1