I expect Brown-breasted to show much more yellow on the lower mandible especially to the tip of it, and a much more longer bill.
here a pic showing well Ferruginous Fly lower mandible :
http://orientalbirdimages.org/se ... _ID=&pagesize=1
here one showing BB Fly:
http://orientalbirdimages.org/se ... _ID=&pagesize=1
And again look at the proportion of tail left after the wing tip in Ferruginous compare to Brown-breasted, this is a very obvious feature from this angle, you even can use the undertail covert as a good reference for the wing tip position. And again the undertail covert should be of the same color of the belly (pale) and contrast with the flank in BB Fly, where in your bird they are clearly of the same rufous color than on the flank and this is also a good way to separate this two species from this angle I think.
And don't rely on what is mention on the reserve list, this is often not very accurate depending on the coverage of the reserve.
I can't do anymore.
Nice Brown shrike picture.
All the best,
Jonathan
