dark-sided vs grey streaked flycatcher

On first glance, it looks like dark-sided.  But after adjusting the exposure of the photo, it looks like an immature grey-streaked.
Interesting.  Would like to hear from the experts.

[ Last edited by irsychan at 8/10/2015 08:43 ]


Original posted by ajohn at 8/10/2015 15:18
It looks like a juvenile Dark-sided to me.
- The underparts appear to be mottled with dark, rather than showing defined streaks
- The bill looks relatively short, and mostly dark
- The eye-ring broad ...
I agree with your excellent assessment that this is a first-winter Dark-sided flycatcher.  I just found a paper entitled "Brown, Siberian and Grey-streaked Flycatchers: identification and ageing" by Paul J. Leader (British Birds 103. November 2010), which gives detailed discussion on the differences between Asian Brown, Dark-sided and Grey-streaked, covering both adults and juveniles.  The section on 'Wing shape and primary projection' and Fig. 2 are particularly helpful in further supporting that this is Dark-sided.