brendank

I suggest it is a hybrid between Rufous-tailed and Japanese Robin. I think the white throat and scalloped breast suggests Rufous-tailed but reddish tones to head suggest Japanese Robin. Brazil shows both species breeding on southern Sakhalin Island.

brendank

Hybrids have been reported between Common Nightingale and the Thrush Nightingale (both of same genus luscinia). I can't find any records of any of the East Asian species of luscinia hybridizing.

http://link.springer.com/article ... -011-0700-7?LI=true

brendank

I find it hard to imagine with the number of bird photographers in Japan, if such a white throated plumage did exist for Japanese Robin, that it would not yet be documented.