This is an immature lacking the adult's black barring on the underparts, but starting to develop a white blaze across its forehead for which this species is named. Birds breeding in East Asia and Western Canada and Alaska were formerly referred to as "Pacific White-fronted Goose" A. a. frontalis and described as being larger, with longer bill and darker head compared to nominate birds of Western Europe. However analysis by Banks (2011) found that frontalis is a junior synonym of A. a. gambelli breeding from interior Alaska to Hudson Bay. Furthermore the portion of the former A. a. frontalis breeding in East Asia and wintering in Japan are now merged with nominate A. a. albifrons. Canon PowerShot SX60.
References:
Banks, R. C. 2011. Taxonomy of Greater White-fronted Geese (Aves: Anatidae). Proceedings of the Biological Society of Washington. 124: 226-233.
Carboneras, C. & Kirwan, G.M. (2019). Greater White-fronted Goose (Anser albifrons). 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/52813 on 6 May 2019).
Ely, C. R. and A. X. Dzubin (1994). Greater White-fronted Goose (Anser albifrons), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.131
Madge, S. & H. Burn (1988) Waterfowl: An identification guide to the ducks, geese and swans of the world. Houghton Mifflin, Boston.
Sibley, D. (2011) Distribution of Greater White-fronted Goose subspecies.