Note the scaly fringing to the wing coverts indicating a juvenile. This is one of two juveniles competing with Dolphin Gulls for fish scraps at the dock. This is the darker race M. c. temucoensis found in extreme southern South America. SACC Proposal 561 (Remsen et al. 2018) to move this species to the genus Phalcoboenus as proposed by Fuchs et al. (2012) and adopted by
Bierregaard et al. (2018) failed. Canon PowerShot SX50 HS.
References:
Bierregaard, R.O., Jr, Kirwan, G.M. & Boesman, P. (2018). Chimango Caracara (Phalcoboenus chimango). 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/53195 on 28 April 2018).
Chimango Caracara (Milvago chimango), 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/chicar1
Fuchs, J., Johnson, J.A. & Mindell, D.P. (2012) Molecular systematics of the caracaras and allies (Falconidae: Polyborinae) inferred from mitochondrial and nuclear sequence data. Ibis 154(3): 520-532.
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 28 April 28 2018. A classification of the bird species of South America. American Ornithologists' Union. http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm
Sarasola, J.H. & Bechard, M.J. (2011). Not as similar as thought: sexual dichromatism in Chimango Caracaras is expressed in the exposed skin but not in the plumage. J Ornithol 152:473–479.