Birds in Hokkaido differ strikingly from those on Honshu south. These are G. g. brandtii characterized by tawny head, streaked crown, and reddish-brown eyes. They lack the scaled crown and black lores of G. g. japonicus. Here I follow Gill & Donsker (2019), Christidis et al. (2018) & Madge et al. (2019) in treating the race, G. g. bambergi accepted by Clements et al. (2018) to be a junior synonym of G. g. brandtii. Canon PowerShot SX60.
References:
Christidis et al. 2018. The Howard and Moore Complete Checklist of the Birds of the World, version 4.1 (Downloadable checklist). Accessed from https://www.howardandmoore.org
Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
Gill, F & D Donsker (Eds). 2019. IOC World Bird List (v9.1). doi : 10.14344/IOC.ML.9.1. Available at http://www.worldbirdnames.org/
Madge, S. & Burn, H. (1994) Crows and Jays: A Guide to the Crows, Jays and Magpies of the World. Houghton Mifflin, Boston.
Madge, S., Christie, D.A. & Kirwan, G.M. (2019). Eurasian Jay (Garrulus glandarius). 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/60727 on 26 April 2019).