Reasons:
Its back isn't like olive-green color -> it is not Olive-backed Pipit.
It doesn't show strong black streaks on upperparts -> it is not Red-throated Pipit.
It doesn't have prominent primary projection -> it is not Pechora Pipit.
Therefore, my choice is Buff-bellied Pipit.
Any advice please?
Thank you very much!
Regards,
Alan