I think the combination of red orbital ring outlined by white and red bill gives this bird a somewhat
crazed look. This is a breeding plumage (alternate) adult on top and a juvenile on the bottom. The solid gray upperparts
are unusual for a juvenile large gull. In other species the back is scaly with pale feather edges. This distinctive
gull is endemic to the coasts of Patagonia in southern South America. It is primarily a scavenger. Here they were
going after discarded fish heads. Some authors (e.g. Burger et. al 2018) place this species with other gulls in
the genus Larus. Historically it was placed in its own genus, Gabianus. See: SACCprop250
for details on current classification. in Leucophaeus. Formerly called Scoresby's Gull. Canon PowerShot
SX50 HSReferences:
Burger, J., Gochfeld, M., Garcia, E.F.J. & Boesman, P. (2018). Dolphin Gull (Larus scoresbii). 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/53961 on 29 April 2018).
Dolphin Gull (Leucophaeus scoresbii), 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/dolgul2
Howell, S.N.G. and Dunn, J. (2007) A Reference Guide to the Gulls of the Americas. Peterson Field Guides, New York.